1500+ Most Important Chemistry Mcqs With Answers 2023

Chemistry Mcqs With Answers for test preparation from basic to advanced. Questions on chemistry are taken from different sections of the subject “Chemistry.” Here, you will find Chemistry Mcqs With Answers from basic to advanced. This will help you get better grades in chemistry.

These MCQs are useful for students and job seekers, such as MCAT ECAT ETEA Exam Preparation, PPSC Test, FPSC Test, SPSC Test, KPPSC Test, BPSC Test, PTS, OTS, GTS, JTS, and CTS.

Important Instructions For Chemistry Mcqs With Answers PDF

  1. Plan your time; time is the biggest constraint in MCQ exams, so to deal with the constant panic of losing time, here is an important strategy; for example, if you have one hour for MCQ exams, divide it into three parts in the first 15 minutes for skimming the paper. Read through all the questions, and you will find some small, easy-to-solve direct questions as you go along. Solve them instantly, giving you an initial boost of confidence.
  2.  During the next 30 minutes, answer the remaining questions. If something is difficult, spend a maximum of a minute on it. The last 15 minutes is a time to address these complex issues and make some reasonable guesses for these issues that cannot be resolved.
  3.  Take your time, read the question twice, pay attention to words that do not always completely change the question, double-check the exact requirements, and underline these words and other important keywords. If you think the first option is correct, don’t do this. Take your time to circle the answer sheet; make sure you read all the options carefully before choosing an answer. Also, prepare all these given Chemistry Mcqs With Answers.
  4.  Use the hints from the question. This strategy has three parts. Just like MCQ first in math questions, if the calculation seems too lengthy, one easy way is to put the options back in the question and check if the equation is balanced. 
  5.  Strategy number four is called context-oriented memory. Sometimes, we ponder MCQ questions with vague answers in our minds. We struggle to remember them, but we’re just stuck. To save us, there’s a trick in psychology called context. Based on memory, he says that to remember some missing information, try to remember where you learned this information, whether it was in a book or on the Internet, whether it was from a teacher or a friend, and even try to remember in which corner of the page was this graph. It can make your mind connect the dots and find the missing information. It works even if you forget where you kept the keys and with that key information.
  6.  Strategy number five is practice, practice, practice, so here is Chemistry Mcqs With Answers. There is no MCQ hacking strategy that is superior to this one. Practice daily, check your answers, revisit concepts, and understand the types of questions being asked. Now you’re left with some tough questions, and if there’s no negative score or the negative score is very low, then you can go ahead and make some smart guesses.

Related Article: General Knowledge Mcqs With Answers 2023 | General Knowledge Mcqs PDF

The soul of chemistry is dealing with___________?

A. Internal structural changes in matter
B. Composition of matter
C. Properties of matter
D. Composition and properties of matter

The radioactive isotope of hydrogen is called___________?

A. tritium
B. deuterium
C. protium
D. ortho-hydrogen

Electron was discovered by? 

A. Michael Faraday
B. James Maxwell
C. Yuri Gagarin
D. J.J Thomson

Sodium carbonate is produced by____________? 

A. haber process
B. Amonia solvay process
C. decons process
D. lead chamber process

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Chemistry Mcqs With Answers: Which of the following is a substance?

A. Sea water
B. Brass
C. Tape water
D. Graphite
E. Sand

Some substances are good conductor of electricity in both the solid and liquid states. These substances are generally______________?

A. ionic substances
B. metallic substances
C. molecular solids
D. covalent network solids

Chemistry Mcqs With Answers
Chemistry Mcqs With Answers

All of the following substances are crystalline except_____________? 

A. Ice
B. Diamond
C. Sucrose
D. Plastic

Covalent network crystals have_____________?

A. higher melting point then molecular crystals
B. lower melting point then molecular crystals
C. discrete molecules linked by Van der waals forces
D. hydrogen bonding

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What is a mixture of Potassium Nitrate Powdered Charcoal and Sulphur called?

A. Pain
B. Glass
C. Gun Powder
D. Cement

Diameter of an atom is in the order of________________? 

A. 0.2m
B. 0.2mm
C. 0.2nm
D. 0.2pm

Mass spectrometer is used to determine Mass number of isotopes and__________?

A. Atomic number
B. Relative abundance
C. Electronic configuration
D. All of the above

The number of peaks obtained in mass spectrometry shows__________?

A. Relative abundance
B. Average mass of element
C. Number of isotopes
D. Relative isotopic mass

Empirical formula of chloroform is___________?

A. CH2 C12
B. CH3C1
C. CC14

Molecular mass of water (18g) means___________?

A. 1-mole molecules of water
B. 1-gram molecule of water
C. 3-gram atoms
D. all

Which of the following statements about isotopes is correct? 

A. Isotopes with odd atomic number are abundant
B. Isotopes with odd atomic number and even mass number are abundant
C. Isotopes with even atomic number and even mass number are abundant
D. Isotopes with even atomic number and odd mass no are abundant

One mole of CO2 contains.

A. 6.022 x 1023 atoms of oxygen
B. 22-gram electrons
C. 6.022 x 1023 atoms of carbon
D. both B. & C.

The number of isotopes of elements with even mass number and even atomic number are ________________?

A. 280
B. 300
C. 154
D. 54

Which of the following terms is not used for ionic compound?

A. formula unit
B. empirical formula
C. molecular formula
D. formula mass

moles of each aluminum and oxygen react with each other to produce aluminum oxide. The amount of product formed is______________________?

A. 0.18 mole
B. 0.27 mole
C. 0.24 mole
D. 0.09 mole

Chemistry Mcqs With Answers
Chemistry Mcqs With Answers

1000+ Most Excepted Chemistry Mcqs With Answers

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Which one of the following has the maximum number of isotopes?

A. oxygen
B. carbon
C. tin
D. chlorine

The volume occupied by 2.8 g of N2 at STP______________?

A. 2.24 dm3
B. 22.4 dm3
C. 1.12 dm3
D. 112 dm3

The number of moles of CO2 which contains 16 g of oxygen is_________? 

A. 0.25
B. 0.5
C. 0.75
D. 1

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How many isotopes have odd atomic number ?

A. 154
B. 280
C. 86
D. 300

Percentage of calcium in calcium carbonate is_________?

A. 80%
B. 30%
C. 40%
D. 20%

Mostly elements have fractional atomic masses because of______________?

A. Mass of an atom itself is in fraction
B. Atomic masses are average masses of isobars
C. Atmoic masses are average masses of isotopes proportional to their relative abundance
D. Atmoic masses are average masses of isotopes

Which of the following is not a macromolecule ?

A. sand
B. haemoglobin
C. diamond
D. maltose

Isotopes of the same elements has____________?

A. different number of protons
B. same number of neutrons
C. different number of neutrons
D. same mass number (nucleon number)

When cationic molecular ions are allowed to pass through strong magnetic field in mass spectrometer which of the following ions is fallen_____________?

A. lighter
B. intermediate
C. heavier
D. are collected at same time

For which of the following compounds the term empirical formula cannot be applied?

A. Nalco
B. H2O
D. It can be applied to all mentioned above

The properties of an element mostly corresponds to that isotope which has greater__________? 

A. Mass number
B. Atomic mass
C. Relative abundance
D. all of the above

1 a.m.u =__________________?

A. 1.6 x 10-27 kg
B. 1.6 x 10-24 kg
C. 1.6 x 10-26 kg
D. 1.6 x 10-28 kg

Which of the following are isoelectronic species?

A. H+ H H-
B. Li+ Na+ K+
C. C1- Br- I
D. F- Ne Na+

Molecular ions are formed by passing______________________?

A. High energy electron beam
B.? – Particle
C. X-rays
D. All of the above

Which one is true about isotope?

A. Same number of neutrons
B. Same mass number
C. Same physical properties
D. same chemical properties

Which of the following ion formation is always exothermic?

A. Unit-negative
B. Unit-positive
C. Di-negative
D. Di-positive

The sample of isotopes of an element, which needs not to be vaporized in the vaporization chamer_________________?

A. Gas
B. Liquid
C. Volatile solid
D. All

Avogadro’s number may represent_________________?

A. volume of particles
B. number of particles
C. mass of particles
D. All of the above

Size of molecule depends upon________________?

A. Atomicity
B. Shape of molecule
C. Both A and B
D. Difficult to predict

Which of the following terms is used for the mass of chlorine 35.5 ?

A. relative atomic mass
B. mass number
C. atomic weight
D. relative isotopic mass

Which one of the following is not the mono isotopic element ?

A. arsenic
B. uranium
C. iodine
D. nickel

The mass of decimole of electrons (NA) is________? 

A. 1.008 mg
B. 0.184 mg
C. 0.054 mg
D. 5.4 mg

Which of the following statements is wrong about isotopes?

A. they possess different mass number
B. they possess different physical properties
C. they possess same chemical properties
D. they possess different position in the periodic table

Qualitative analysis is carried out for _________________?

A. identification of elements
B. estimation of amounts of elements
C. molar ration of elements
D. molar volume of elements

Combustion analysis is performed to determine___________?

A. Empirical formula
B. Molecular mass
C. Molecular formula
D. Formula mass

Isotopes differ in________?

A. properties, which depend upon mass
B. arrangement of electrons in orbitals
C. chemical properties
D. all of the above

Which of the following methods is used to estimate hydrogen in an organic compound?

A. Combustion method
B. Dumas method
C. Kjeldahls method
D. All of the above methods are for different purposes

The nucleus of an atom of every element will always contain____________?

A. neutrons
B. protons and electrons
C. protons
D. protons and neutrons

When 0.5 mole of phosphoric acid is dissolved in aqueous solution how many moles of -ve and +ve ions are collected altogether?

A. 0.5
B. 1
C. 1.5
D. 2

Dempsters mass spectrometer has number of zones / parts____________?

A. 5
B. 4
C. 3
D. 2

All the following variables are used to describe gases except____________?

A. pressure
B. volume
C. moles
D. density

Methyl alcohol is not used as___________________?

A. a solvent
B. an anti-freezing agent
C. a substitute for petrol
D. for denaturing of ethyl alcohol

Oxygen (molecular weight = 32) diffuses at a rate of 10cm3/min under the same conditions of temperature and pressure how fast will hydrogen (molecular weight = 2) diffuse?

A. 20cm3/min
B. 40cm3/min
C. 160cm3/min
D. 2.5cm3/min

As a substance moves from a solid to a liquid all of the following changes occur except?

A. molecules become more disordered.
B. K.E of the molecules decreases
C. intermolecular forces become weaker.
D. molecules move more frequently.

The rectified spirit is________________?

A. 12% alcohol
B. 90% alcohol
C. 95% alcohol
D. 100% alcohol

Which of the following solids show anisotropy___________________?

A. Plastic
B. Glass
C. Rubber
D. None of the above

Butyl chloride gives possible isomers?

A. 2
B. 3
C. 4
D. 5

Metallic crystals are soluble in________________?

A. Polar solvent
B. Non polar solvent
C. Fused metal
D. None

Paramagnetic behaviour of substance is measured by a balance called___________________?

A. Analytical balance
B. Guoys balance
C. Electrical balance
D. Single beam balance

Which of the following properties prove that cathode rays are material in nature_________________?

A. they cast shadow
B. they possess momentum
C. they are negatively charged
D. all of the above

When an electron is moving with velocity of 2.188 x 106 ms-1 in the first orbit of Bohrs model of hydrogen. The de Broglie wavelength of electron is______________?

A. 0.33 nm
B. 0.34 nm
C. 0.35 nm
D. 0.36 nm

When methl iodide and ethyl iodide are treated with sodium metal possible major products are obtained ?

A. 1
B. 2
C. 3
D. 4

Which statement is consistent with Hunds rule ?

A. Electrons fill orbitals with parallel spins until all the orbitals of the same energy are half filled then they go into sub-shells with anti-parallel (opposite) spin.
B. The electrons in the same atom cannot have the same four quantum numbers
C. There is maximum of two electrons is an orbital.
D. None

Atomic number of Mn is 25 what is the electronic configuration in the ground state________________?

A. 1s2 2s2 2p6 3s2 3p6 3d7
B. 1s2 2s2 2p6 3s2 3p6 4s2 4p5
C. 1s2 2s2 2p6 3s2 3p5 3d10
D. 1s2 2s2 2p6 3s2 3p6 4s23d5

Which of the following is mineral fiber ?

A. Teflon
B. asbestos
C. saran
D. acrylic

The hardest of the following solids is__________?

A. sodium
B. diamond
C. graphite
D. magnesium

Which of the solid does not contain covalent bond___________?

A. copper
B. ice
C. diamond
D. graphite

The balanced chemical equation for the reaction which occurs when Be is added to water is____________?

A. Be+2H2O?Be (OH)2+H2
B. Be+H2O?Be (OH)2+H2
C. Be+H2O?[Be (OH)4]+2+H2
D. no reaction

Which of the following theories is superior to others__________________?

D. none of the above

Chemistry Mcqs With Answers | Chemistry MCQs Quiz Test Questions

Our over 1,000 Multiple Choice Questions and Answers (Chemistry Mcqs With Answers) in Chemistry for all grade students, especially for matric and up to Grade 12 (with over 1,000 Chemistry Mcqs With Answers) cover all areas of chemistry, covering over 200 topics. You can get acquainted with the Chemistry MCQ for the 11th grade here.

These topics are selected from a collection of the most authoritative and best reference books on chemistry. To comprehensively learn and assimilate the subject of Chemistry, you need to practice these MCQs for 1 hour a day for 2-3 months. This method of systematic study will easily prepare anyone for Chemistry Exams – Grade 12, Contests, Online Tests, Quizzes, MCQ Tests, Interviews, and Certificates.

Which of the following is not characteristics of reversible reaction__________________?

A. whole amount of reactant does not change into product
B. chemical equilibrium is established
C. a catalyst changes the direction of reaction
D. rate of forward reaction decreases as reaction proceeds

A solution has pH = 0 its H+ ion concentration is__________________?

A. 1 x 10-1
B. 1 x 10-14
C. 1 x 10-7
D. 1

1 mole of electron has mass in microgram_________________? 

A. 1.008 x 10-3
B. 5.5 x 10-4
C. 1.84 x 10-4
D. 1.673 x 10-3

The use of antifreeze in the automobile radiator is an important application of____________?

A. constitutive property
B. additive property
C. colligative property
D. intrinsic property

At which electrode the reduction of the solution is occurring in Al-Ag cell_____________?

A. A
B. Ag
C. Both
D. Neither

In which of the following type of reactions energy of reactant is greater than energy of product________________?

A. endothermic
B. exothermic
C. unpredictable
D. same

Which of following metals can be displaced by all other metals from its solution ?

A. Ag
B. A
C. Au
D. Cu

Which of the elements do not fall in stair case of the modern periodic table_____________?

A. Si
B. As
C. Te
D. None of the above

Across short period the melting and boiling point increase upto __________________?

A. IIIA group
B. IVA group
C. VA group
D. VIA group

Which of the following is the formula of chrome red ?

A. Pb3 O4
B. 2Pb CO3 – Pb (OH)2
C. Pb Cr O4 – Pb (OH)2
D. Pb2O

Regular coiling or zigzagging of polypeptide through hydrogen bonding is its___________________?

A. Quantum structure
B. Secondary structure
C. Tertiary structure
D. Primary structure

In the van der Waals equation (P + n2a / v2) (v – nb) = nRT which of the following statement is not true ?

A. n2a/v correct for the intermolecular forces.
B. nb correct for the volume occupied by gas molecules.
C. at high densities the equation reduces to the ideal gas law
D. all of the above statements are correct.

The inhaled breath of diabetics patient contain acetone. A medical student wishes to test for diabetes by asking patient to bubble their breath through a reagent ?

A. alkaline aquenous iodine
B. aqueous bromine
C. Fehling solution
D. aqueous NaOH

When aquious bromine is added to aqueous phenol a creamy white ppt is obtained. What does this reaction show ?

A. phenol is unsaturated
B. 2-bromophenol is insoluble in water
C. a hydroxy group makes the benzene ring more susceptible to electrophilic attack
D. acid-base reaction

If a graph is plotted between temperature on x-axis and volume on y-axis for 1 mole of gas then we get straight line which cuts the temperature exis at________________?

A. 0?C
B. 273.16K
C. ?273.16 K
D. ?273.16?C

Benzene is a good solvent for__________________?

A. fats
B. resins
C. iodine
D. all the above

Which of the following element doesnot show allotropy_________________? 

A. Carbon
B. Arsenic
C. Nitrogen
D. Sulphur

Purines and pyrimidines are_________________?

A. Enzymes
B. Nitrogenous bases
C. Carbohydrates
D. Lipids

All the transition elements show_________________?

A. Similar physical properties
B. Similar chemical properties
C. Both A and b
D. None

In solids the temperature is the measure of__________________?

A. Average kinetic energy of molecules
B. Vibrational kinetic energy
C. Translational kinetic energy
D. None of the above

Fruit juices and fizzy drinks such as lemonade are often sold in aluminium cans. What is the most important reason aluminium is a suitable metal ?

A. aluminium can be recycled
B. aluminium has very low density
C. aluminium is the most abundant metal in the earth crust
D. aluminium is resistant to corrosion by organic acids.

On heating aldehydes with Fehlings solution we get a precipitate whose colour is_________________?

A. pink
B. black
C. yellow
D. brick red

What is maximum number of electrons in an orbital with m (magnetic quantum number) = 3 ?

A. 6
B. 4
C. 3
D. 2

Which catalyst is used in contact process ?

A. Fe2O3
B. V2O5
C. SO3
D. Ag2O

Which of the following elements has greater 1st ionization energy__________________?

A. B
B. C
C. N
D. O

Which of the following molecule is polar__________________?

B. CO2
C. BF3
D. none of the above

Which of the following points are important in connection with equilibrium constant ?

A. Kc is constant at given temperature
B. Kc is unaffected by change in concentration of reactants or products
C. Kc indicates the extent of reaction but not about the rate of reaction.
D. All of the above

Solubility of CaF2 is 2.0×10-4 gdm-3 then Ksp of CaF2 is_______________?

A. 4.0 x 10-8
B. 3.2 x 10-11
C. 2.0 x 10-8
D. 4.0 x 10-12

The unit of molality is__________________?

A. moles dm-3
B. moles kg-1
C. gram dm-3
D. none

A solution can be both____________________? 

A. dilute and concentrated
B. dilute and saturated
C. saturated and unsaturated
D. saturated and super saturated

Consider the following redox reaction. Zn+dil HNO3? Zn (NO3)2 + N2O + H2O The coefficient number of HNO3 in the equation is__________________?

A. 6
B. 8
C. 10
D. 4

Which of the following elements react with steam to produce H2 gas?

A. Pd
B. Ni
C. Sn
D. All of the above

The unit of the rate constant (k) is same as that of rate of reaction________________?

A. First order reaction
B. Second order reaction
C. Zero order reaction
D. Third order reaction

Acid present in acid rain may be_________________?

A. H2SO4
C. both A and B
D. none of the above

Which of the following elements conduct electricity and also melts below 100°C ?

A. Aluminium
B. Sodium
C. Carbon
D. Sulphur

The compound which is added to leaded gasoline to save engine from lead oxide and lead sulphate deposits is__________________?

A. Ethylene iodide
B. Ethylene bromide
C. Ethylene chloride
D. Ethylene fluoride

Isotopes differs in______________________?

A. arrangement of electrons in orbitals
B. position in the periodic table
C. properties depend upon mass
D. chemical properties

The volume occupied by 1.4g CO at S.T.P is___________________?

A. 22.4 dm3
B. 2.24 dm3
C. 1.12 cm3
D. 1.12 dm3

Which of the following set has all species isoelectronic__________________?

A. F – Cl – Br
B. Li+1 – Na+1 – K+1
C. F – Ne – Na+
D. H+ – H- – H

Water absorber used in combustion analysis is___________________?

A. 50% KOH
B. Lime water
C. CaCl2
D. Mg (CIO4)2

The type of filtering media used for filtration depending upon____________________?

A. Nature of reactants
B. Nature of crucible
C. Nature of product
D. Nature of precipitate

A method of separation of components from its solution using Distribution law is ___________________?

A. Sublimation
B. Crystallisation
C. Solvent extraction
D. Distillation

Equal masses of methane and oxygen are mixed in empty container at 250?(C) The fraction of total pressure exerted by oxygen is___________________?

A. one / seventeen
B. sixteen / seventeen
C. one / three
D. two / three

The molecules of CO2 in dry ice form__________________?

A. Ionic crystal
B. Covalent crystal
C. Molecular crystal
D. Any type of crystal

Only London dispersion forces are present among the__________?

A. Molecules of water in liquid state
B. Atoms of helium in gaseous state at high temperature
C. Molecules of hydrogen chloride gas
D. Molecules of solid iodine

Quantum number values for 3p orbitals are______________?

A. n=3 l=2
B. n=3 l=0
C. n=3 l=1
D. n=3 l=3

Which specie has unpaired electrons in antibonding molecular orbitals_______________?

A. O2+2
B. N2-2
C. B2
D. O2-2

For a given process the heat changes at constant pressure (qp) and at constant volume (qv) are related to each other as____________?

A. qp = qv
B. qp < qv
C. qp > qv
D. qp = qv / 2

Solubility product of AgCl is 2.0 x 10-10 mol2 dm-6. Maximum Concentration of Ag+1 ions in the solution is_______?

A. 2.0 x 10-10 mol dm-3
B. 1.414 x 10-5 mol dm-3
C. 1.0 x 10-10 mol dm-3
D. 1.0 x 10-5 mol dm-3

Which of the following solution has the highest boiling point ?

A. 5.85% NaCl Solution
B. 18.0 % glucose solution
C. 6.0 % urea solution
D. All have same boiling point

Which of the following can be used in laptops ?

A. Silver oxide battery
B. Fuel cell
C. Nickel cadmium cell
D. Lead accumulator

Which is the unit of (K) rate constant for zero order reaction ?

A. s-1
B. mol dm-3 s-1
C. mol-1 dm3 s-1
D. mol-2 dm6 s-1

Which is carnalite________________? 

C. KCI MgCl2 6H2O
D. Na2CO3. 10H2O

The most reactive allotropic form of phosphorus is________________?

Chemistry Mcqs With Answers
Chemistry Mcqs With Answers

A. White
B. Redox potential
C. Black
D. Violet

Which molecule has the highest bond energy among the halogens_________________?

A. Fluorine
B. Chlorine
C. Iodine
D. Bromine

The most paramagnetic element is____________________?

A. Iron
B. Cobalt
C. Chromium
D. Manganese

Which one of the following looks odd__________________?

A. H2SO4
B. KMnO4
C. H2S
D. K2CrO4

In 1 – pentene -4- yne the carbon exhibit hybridization_________________?

A. sp3 – sp2
B. sp2 – sp
C. sp2 – sp
D. sp3 – sp2 – sp

When benzene is heated in air with V2O5 at 450°C yields_________________?

A. Phenol
B. Maleic anhydride
C. Glyoxal
D. Benzoic acid

Which one of the following will be sulphonated readily?

A. Chlorobenzene
B. Toluene
C. Nitrobenzene
D. Benzene

When CO2 is made to react with ethy1 magnesium iodide in dry ether followed by acid hydrolysis yields______________?

A. Carboxylic acid
B. Ethanoic acid
C. Propanoic acid
D. Butanoic acid

Ethy1 chloride on reduction in the presence of Zn/HCI produces___________________?

A. n. butane
B. Ethanol
C. Ethane
D. Diethy1 ether

For industrial preparation of CH3CHO catalytic promoter is________________

A. PdCl2
B. Cu2Cl2
C. CuCl2
D. PbCl2

Which of the following is not a fatty acid ?

A. Propanoic acid
B. Acetic acid
C. Phthalic acid
D. Butanoic acid

Which one of the following fertilizers provides the nitrogen and phosphorus to the plant ?

A. Urea
B. Calcium superphosphate
C. Diammonium phosphate
D. Potassium nitrate

Chlorination of water may be harmful if the water contains_________________?

A. Ammonia
B. Dissolved oxygen
C. Carbon dioxide
D. All

The mass of one mole of electron is________________?

A. 1.008
B. 0.55
C. 0.184
D. 1.637

The number of atoms in a molecule determines________________?

A. macromolecule
B. macromolecule
C. molecularity
D. atomicity

Which element has same isotopes like palladium___________________?

A. Nickel
B. Calcium
C. Cadmium
D. Tin

A limiting reactant is one which________________?

A. is taken in lesser quantity in grams as compared to other reactants
B. is taken in lesser quantity in volume as compared to other reactants
C. gives the maximum amount of the product which is required
D. gives the minimum amount of the product under consideration

A safe and more reliable method for drying the crystal is__________________?

A. Hot air currents
B. folds of filter paper
C. oven
D. Vacuum desiccator

A real gas obeying vander waals equation will resemble the ideal gas if_______________________?

A. Both a and b are small
B. Both a and b are large
C. a is small and b is large
D. a is large and b is small

Plasma is used in_________________?

A. Fluorescent bulb
B. Neon signs
C. Lasers
D. All of these

Which of the following is pseudo solid_____________________?

A. CaF2
B. NaCl
C. Glass
D. Diamond

Bohrs model is contradicted by__________________?

A. Plancks theory
B. Dual nature of matter
C. Heisenbergs uncertainty principle
D. All of these

Atomic radius can be determined by_________________?

A. X – ray diffraction
B. Spectrophotometer
C. Optical microscope
D. Electron microscope

For which system does the equilibrium constant Kc has unit of (concentration)-1__________________?

A. N2+3H2 2NH3
B. H2+I2 2HI
C. 2NO2 N2H4

18g glucose is dissolved in 90g water the relative lowering in vapour pressure is equal to ___________________?

A. 8
B. 5.1
C. 6
D. one/fifty one

Stronger is the oxidizing agent greater is the___________________?

A. Oxidation potential
B. Redox potential
C. e.m.f of cell
D. standard reduction potential

Which is true about Zn-Cu galvanic cell ?

A. Reduction occurs at anode
B. K+ ion transfer from salt bridge to left beaker of ZnSO4
C. Oxidation occurs at cathode
D. Anode is negatively charged

Nitrates of which pair gives different products on thermal decomposition___________________?

A. Na K
B. Mg Ca
C. Li Na
D. Li Ca

Keeping in view the size of atom which is in correct order___________________?

A. Mg > Sr
B. Ba > Mg
C. Lu > Ce
D. CI > 1

The common name of propane -1 3-dioic acid is____________________?

A. Oxalic acid
B. Succinic acid
C. Malonic acid
D. Fumaric acid

Industrial materials thermal power stations are coated with__________________?

A. Polyester resins
B. Epoxy paints
C. polyamide resins
D. Polyvinyl chloride

Main source of organic compounds is__________________?

A. Animal
B. Fossil
C. Coal
D. Plants

Hydro carbons which burn with smoky flame are called_________________?

A. Aliphatic
B. Alicyclic
C. Aromatic
D. Aldehyde

Octane number 2 2 4-trimethyl pentane is__________________?

A. 100
B. 90
C. 80
D. 70

Geometric isomerism is usually found in___________________?

A. Alkanes
B. Alkenes
C. Alkynes
D. Esters

Organic compounds that are essentially nonpolar and exhibit weak intermolecular forces have________________?

A. Low melting points
B. Low vapour pressure
C. High boiling points
D. High electrical conductivity

According to vital force theory_______________?

A. Oorganic compounds can be synthesized from inorganic compounds
B. organic compounds cannot be synthesized from inorganic compounds
C. organic compounds can be synthesized by animals
D. organic compounds can be synthesized by plants

A double bond consists of __________________?

A. Two sigma bonds
B. Two Pi bonds
C. One sigma and one Pi bonds
D. One sigma and two Pi bonds

Chemical properties of first member of homologous series with respect to other members are_________________?

A. same
B. different
C. depends upon number of C atoms
D. depends upon number of H atoms

Compounds having same molecular formula but differ in structural formula are called __________________?

A. polymer
B. monomer
C. isomer
D. allotropes

Organic compounds are soluble in ____________________?

A. polar solvent
B. non-polar solvent
C. alkalies
D. water

Methane is used in power generation in chemical industries being a__________________?

A. natural gas
B. good caloric value
C. cheaper
D. All

The precess in which larger molecule with higher molecular weight breaks down into smaller moleucles with lower molecular weight____________________?

A. polymerization
B. pyrolysis
C. isomerism
D. no such process occurs

The metallic sound produced by engine due to the pre-ignition of fuel is called _______________?

A. knocking
B. reforming
C. cracking
D. a and c

Which of the following can be used as anti-knocking agent ?

A. PbCl2
B. (C2H5)4 Pb
C. (C2H5)2 Pb
D. all of the above

Isomerism which is present only in alkene is__________________?

A. structural isomerism
B. metamerism
C. cis-trans isomerism
D. both b and c

Compound containing benzene ring in their structure are __________________?

A. aliphatic
B. aromatic
C. carboxylic acid
D. carbohydrates

Which of the following is an amide________________?

A. R-NH2
C. R – NH – R
D. C6H5NH2

Only sigma bonds are present in__________________?

A. propene
B. butanoic acid
C. butanal
D. ethoxy ethane

The structure of ethyne is_________________?

A. angular
B. trigonal
C. linear
D. trigonal planar

The general formula of cycloalkene is __________________?

A. CnH2n
B. CnH2n+2
C. CnH2n-1
D. CnH2n-2

C5H12 has the number of isomers ___________________?

A. one
B. two
C. three
D. four

Octane number can be improved by________________?

A. Isomerization
B. Adding (C2H5)4 Pb
C. Adding (CH3)4 Pb
D. All

Octane number 2 2 4-trimethyl pentane is________________?

A. 100
B. 90
C. 80
D. 70

Propene can exhibit________________?

A. cis-trans isomerism
B. geometric isomerism
C. both a & b
D. none of the above

Pentane and 2-methyl butance have the same_______________? 

A. Boiling point
B. Melting point
C. Percentage composition
D. Structural formula

The first organic compound was synthesized in laboratory by_________________?

A. Wohler
B. Kolbe
C. Berzilius
D. Berthelot

First organic compound synthesized in laboratory was _________________?

A. tartaric acid
B. ethyl alcohol
C. methanol
D. urea

The property of carbon chain formation is called _________________?

A. catenation
B. hybridization
C. polymerization
D. solvation

The organic compounds having very high molecular weight are called _________________?

A. carboxylic acid
B. ketones
C. aldehydes
D. polymers

Rate of reactions of most organic compounds are____________________?

A. very slow
B. very fast
C. slow
D. no regular character present

Coal is produced after a long time decay of_________________?

A. animals
B. fossils
C. wood
D. all of the above

Crude oil is blackish coloured liquid produced after the decay of organic matter present between_________________?

A. earth layer
B. mountains
C. sedimentary rocks
D. rocks

At low temperature and pressure cracking can be done in presence of catalyst________________?

A. Al2O3
B. Fe2O3
C. Al2O3 and SiO2
D. Fe2O3 and SiO2

Which one of the following compounds shows intense knocking ?

A. n-pentane
B. iso-heptane
C. iso-octane
D. n-heptane

Ether functional group can be represented as ____________________?

C. R-O-R

A single atom or group of atoms which gives characteristic properties to a compound is called_________________?

A. radical
B. hydrocarbon
C. functional group
D. ion

2-propanol and 1-propanol show the isomerism________________?

A. metamerism
B. functional group isomerism
C. geometric isomerism
D. position isomerism

In sp3 hybridization the expected geometry of molecules will be__________________?

A. square planar
B. trigonal pyramidal
C. tetrahedral
D. linear

In cyano group the carbon atom shows which kind of hybridization___________________?

A. sp2
B. sp
C. sp3
D. none of the above

the fractional distillation of petroleum produces gasoline up to ________________?

A. 10%
B. 15%
C. 20%
D. 30%

Which is not heterocyclic compound _______________?

A. Furan
B. Thiophene
C. Aniline
D. Pyridine

Which one is not state function ________________?

A. Internal energy
B. Enthalpy
C. Gibbs free energy
D. Work

If internal energy of the system is increased ____________________?

A. Change in state of the system is increased
B. Temperature of the ystem may rise
C. Chemical reaction may take place
D. All

A reaction has values of ?H and ?S which are both positive. The reaction __________________?

A. Is spontaneous
B. Spontaneity is temperature dependent
C. Has an increasing free energy
D. Is non-spontaneous

The environment in which a system is studied is __________________?

A. State function
B. phase
C. surrounding
D. state

Anything which depends upon initial and final state of a system is_______________?

A. environment
B. surrounding
C. state function
D. enthalpy

Reaction in which heat evolves is called ____________________?

A. endothermic
B. spontaneous
C. non-spontaneous
D. exothermic

Pumping of water uphill is_______________?

A. spontaneous process
B. non-spontaneous process
C. irreversible process
D. reversible process

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