CUET 2026 Chemistry MCQs 100 Questions for CUET Exam

Chemistry MCQ Question Answers for CUET 2026

Chemistry MCQs– Practice the Chemistry Multiple Choice Questions suitable for various Entrance Exams including CUET. Learn and practice Chemistry questions and answers. Chemistry MCQ questions are very helpful for various competitive exams. CUET is a Common University Entrance Test that is now mandatory to take admission to Central Universities in India. Chemistry MCQ questions are based on the latest CUET 2026 exam pattern and other entrance exams, so that you can have a fair idea about exam trends that will be followed for various entrance exams.

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1. The half-life of a radioactive element is 50 days. How long will it take far its activity reduce to 1/4 of it original value?

a.75 days

b.50 days

c.25 days

d.100 days

2. If temperature is kept constant during the reaction, the process is said to be….

a.Adiabatic

b.Isothermal

c.Isobaric

d.none of the above

3. Which of the following will have maximum entropy?

a.Helium

b.Diamond

c.Silver

d.Argon

4. Ammonium acetate on heating decomposes to give

a.acetylamine

b.amine

c.acetamide

d.formamide

5. All the radioactive changes are of

a.Third order

b.First order

c.Second order

d.Zero order

6. Formic acid is prepared by distilling glycerol with

a.lactic acid at 50 degree Centigrade

b.oxalic acid at 240 degree Centigrade

c.tartaric acid at 10 degree Centigrade

d.oxalic acid at 110 degree Centigrade

7. Which of the following will give an aldehyde on oxidation?

a.1 propanal

b.2 methyl propane

c.2 methanal

d.Methoxy ethane

8. Once the equilibrium is reached under given condition:

a.Conc. remains the same in spite of the change in temperature

b.Conc. of reactants remains same

c.Conc. of products remains same

d.Conc. of all the substances presents do not change

9. RCOCl reacts with R MgBr to yield

a.primary alcohol

b.ketone

c.secondary alcohol

d.tertiary alcohol

10. An azeotrope is one that

a.cannot be separated by distillation

b.can be separated by distillation above critical solution temperature

c.can be separated by distillation at critical solution temperature

d.can be separated by distillation below critical solution temperature

11. Nobels oil is

a.glycerol

b.trinitroglycol

c.dinitro glycerine

d.glycerol trinitrate

12. Schiffs bax is obtaind by the action of

a.All the above

b.p-amines with acid anhydrides

c.p-amines with acid chloride

d.p-amines with aldehydes

13. Schiffs base on reduction give

a.p-amine

b.tert. amine

c.sec. amine

d.aniline

14. In a spontaneous irreversible process, the total entropy of the system & its surroundings

a.decreases

b.is zero

c.increases

d.is constant

15. Wurtz reaction cannot be used for the preparation of

a.both methane and odd no. of C-atoms

b.alkanes containing odd no. of C-atoms

c.methane

d.alkanes containing even no. of C-atoms

16. In acetylene C-C-H bond angle is

a.96 degree

b.144 degree

c.90 degree

d.180 degree

17. Which of the following acids is manufactured using sawdust?

a.Acetic acid

b.Citric acid

c.Oxalic acid

d.Butyric acid

18. Aniline reacts with dl. HCl and HONO at 00C to form

a.nitro compound

b.diazo compound

c.benzene

d.azo compound

19. The age of most ancient geological formation is estimated by

a.Carbon 14 dating method

b.Radium-silicon method

c.Uranium lead method

d.Potassium-Argon method

20. On mixing 1 mole of ethyl alcohol with 1 mole of acetic acid at 298 K the equilibrium concentration of ester and water becomes 2/3 moles each. If 3 moles of alcohol is mixed with 1 mole of acid, the concentration of ester in moles at equilibrium will be

a.1.1

b.0.9

c.0.09

d.2.2

21. In isopentane the number of secondary carbon atom is

a.2

b.0

c.3

d.1

22. In neopentane the number of primary carbon atoms are

a.4

b.5

c.1

d.2

23. On burning hydrogen in an atmosphere of chlorine, 1.65 gm of HCl was obtained and 1 Kcal of heat was liberated. The heat of formation of HCl should be:

a.-44.2 Kcal/mol

b.500 cal/mol

c.-21.12 Kcal/mol

d.500 cal/gm

24. 1 Joule is equal to

a.2.39 Cal

b.0.239 Cal

c.1.390 Cal

d.0.04184 Cal

25. 100 gram of caustic soda is dissolved in 1 kg of water, the molality of the solution is

a.3.3

b.2.5

c.25

d.2

26. Electrochemical equivalent is the mass of the element liberated during electrolysis when

a.2 faraday electricity is passed

b.1 coulomb electricity is passed

c.3 amp current is passed

d.1 amp. current for 1 hrs is passed

27. Which of the following is a carcinogen?

a.Aniline

b.Ethyl amine

c.N-nitroso amine

d.Benzenediazonium chloride

28. Out of the following, the weakest interact are involved in

a.polar covalent bond

b.Van der Waals interaction

c.ionic bond

d.hydrogen bond

29. In the case of o-chlorophenol there exist

a.intermolecular covalent bonding

b.both inter and intramolecular hydrogen bonding

c.no hydrogen bonding

d.intramolecular hydrogen bonding

30. N-nitrosoamine when warmed with phenol and conc. sulphuric acid gives green colouration. The amine is

a.quaternary salt

b.tert. amine

c.secondary amine

d.p-amine

31. The maximum number of molecules are in:

a.14 gram of carbon dioxide

b.52 gram of nitrogen peroxide

c.48 gram of ethyl alcohol

d.36 gram of water

32. Salt Bridge is used because it

a.enhances the flow of electrons by overcoming liquid junction potential

b.forms insoluble precipitates with the electrolytes in the two half cells

c.provides the extra ions

d.maintains the electrical neutrality of the two half cells

33. Which of the following shows positive deviation from Raoults law?

a.Ethyl alcohol and cyclohexane

b.Benzene and toluene

c.Acetone and ethyl alcohol

d.Acetone and chloroform

34. Which of the following has minimum boiling point?

a.neopentane

b.n-pentane

c.both A and B

d.isopentane

35. Which of the following carbonium ions is the most stable?

a.triphenyl methyl

b.diphenyl methyl

c.All the above

d.benzyl

36. Which of the following is a sedative?

a.Paraldehyde

b.Metaldehyde

c.Benzaldehyde

d.Paraformaldehyde

37. Which will have the maximum solubility in water?

a.Tert. butyl alcohol

b.1 butanol

c.Isobutyl alcohol

d.Methanol

38. Cobalt present along with iron in the synthesis of ammonia acts as

a.autocatalyst

b.induced catalyst

c.promoter

d.inhibitor

39. Half-life of a first order reaction is 35 min. The time required to reduce its concentration to 12.5% is

a.105 min

b.70 min

c.50 min

d.125 min

40. The bond angle in ammonia is

a.99 degree

b.107 degree

c.110 degree

d.106 degree

41. Vinegar contains

a.100% acetic acid

b.10 to 12% acetic acid

c.19% acetic acid

d.7 to 8% acetic acid

42. On increasing the temperature by 10 K in the case of slow reactions

a.number of collisions get doubled

b.activation energy increases

c.energy of activation decreases

d.value of rate constant increases

43. As the alkyl part goes on increasing in alcohol the solubility of alcohol in water

a.remains constant

b.decreases

c.may increase or decrease

d.goes on increasing

44. Between two elements A and B, the electronegativity difference is 2.0. The per cent ionic character of AB is

a.86

b.15

c.46

d.35

45. The chemical system in equilibrium is not affected by

a.increase in the concentration of reactants

b.change in the concentration of products

c.addition of a catalyst

d.changing the temperature

46. In Lyman series an electron jumps from higher energy level to

a.K energy level

b.N energy level

c.M energy level

d.L energy level

47. Acetic acid exists as dimer in benzene due to

a.presence of hydrogen atom at α-carbon

b.presence of carbonyl group

c.hydrogen bonding

d.condensation reaction

48. Radio-activity was discovered by

a.Henry Becquerel

b.Rutherford

c.J.J. Thomson

d.Madame Curie

49. When a radioactive substance is subjected to a vacuum, the rate of disintegration per second

a.decreases

b.is not affected

c.increase considerably

d.increases only if the products are gaseous

50. Reduction of which of the following will give only ethyl alcohol?

a.propyl methanoate

b.ethyl acetate

c.formic acid

d.methyl methanoate

51. Amongst HX, the maximum dipole moment is of

a.HI

b.HCl

c.HBr

d.HF

52. The number of unpaired electrons in fluorine atoms is/are

a.0

b.2

c.4

d.1

53. Radium and chlorine combine to form radium chloride, the compound is

a.no longer radioactive

b.half as radioactive as the radium content

c.as radioactive as the radium content

d.thrice as radioactive as the radium content

54. Shape of the carboxyl group is

a.pyramidal

b.octahedral

c.planar triangular

d.tetrahedral

55. Shape of amines is

a.tetrahedral

b.pyramidal

c.planar triangular

d.square planar

56. A mole of electrons is the same as

a.ampere-second

b.one

c.curie

d.faraday

57. 75% of a radioactive element disintegrates in 6 days. Its half-life is

a.6 days

b.2 days

c.18 days

d.3 days

58. Equilibrium constant changes with

a.time

b.pressure

c.temperature

d.both temperature and concentration

59. Which of the following solutions will have the lowest freezing point?

a.1% aqueous solution of fructose

b.1% aqueous solution of urea

c.1% aqueous solution of methyl alcohol

d.1% aqueous solution of sodium chloride

60. Among the alkanes with an increase in mol wt…….

a.density decreases

b.f.pt. decreases

c.m.pt. decreases

d.b.pt increases

61. The element with maximum number of electrons in the valence shell has atomic number

a.9

b.3

c.15

d.2

62. Emission is caused by the transformation of one neutron into a proton. This results in the formation of a new element having

a.nuclear charge higher by one unit

b.nuclear charge lower by one unit

c.same nuclear charge

d.lower nuclear charge

63. A mixture of 1-chloropropane and 2-chloropropane is treated with alcoholic KOH. The resulting mixture will have

a.a mixture of 1-propene and 2-propene

b.2-propene

c.1-propanol

d.1-propene

64. On passing one faraday of electricity through molten lead (II) bromide, amount of bromine obtained is

a.1 mole gm atom

b.5 gm mole

c.1 gm equivalent

d.3 mole

65. Half-life period of a zero order reaction is

a.independent of the conc.

b.directly proportional to cube of the conc.

c.inversely proportional to the conc.

d.directly proportional to the initial conc.

66. An electrochemical cell can be changed into an electrolytic cell by

a.reversing the electrodes

b.changing the conc. of the electrolytes

c.changing the electrolytes in two half cells

d.providing higher potential from outside

67. Art of electroplating was enunciated by

a.Kohlorausch

b.Ampere

c.Einstein

d.Brugantally

68. The hydrogen halide which has maximum boiling point is

a.HI

b.HBr

c.HCl

d.HF

69. Heisenberg test can be used to distinguish between

a.primary amines and tertiary amines

b.primary amines, secondary amines and tertiary amine

c.All the above

d.primary amines and secondary amines

70. The number of moles of NaCl in 3 litres of the 3 M solution is

a.5

b.9

c.27

d.36

71. An electrophile is a/an

a.Lewis acid

b.Lewis base

c.Both A and B

d.electron deficient species

72. Williamsons synthesis is used for preparing

a.ether

b.amines

c.ester

d.alcohol

73. Mesitylene is

a.1, 3, 5 trimethyl benzene

b.2, 3, 5 trimethyl benzene

c.2, 2, 4 trimethyl benzene

d.1, 3, 4 trimethyl benzene

74. Calcium formate of heating gives

a.formic acid

b.formaldehyde

c.methanoic anhydride

d.banzaldehyde

75. The rate of chemical reaction depends on the nature of chemical reactants because

a.some are coloured

b.energy of activation differs from one reaction to another

c.all the above

d.some are solid at room temperature

76. In substitution reactions of tertiary halide, the ionisation of halogen atom as negative ion is facilitated by

a.electron repelling group

b.free radical

c.All the above

d.electron attracting group

77. The number of electrons that are shared between two atoms having a triple bond are

a.7

b.3

c.6

d.5

78. Reaction between silver nitrate and sodium chloride goes to completion because

a.silver nitrate is insoluble in water

b.the reaction is instantaneous

c.silver chloride is sparingly soluble in water

d.solubility of silver nitrate increases with sodium chloride

79. How many electrons can fit into the sub-shell for which n = 3 and l = 1?

a.6

b.5

c.16

d.24

80. Which of the following has dipole moment?

a.Both A and B

b.1-propene

c.trans-2-butene

d.cis-2-butene

81. Bromination of isobutene gives as major product

a.None of the above

b.isobutyl bromide

c.tert. butyl bromide

d.n-butyl bromide

82. In the case of exothermic reactions equilibrium constant K

a.remains unchanged with temperature

b.increases with pressure

c.depends on the nature

d.decreases with temperature

83. Which of the following is not a diatomic molecule?

a.Iodine

b.Nitrogen

c.Phosphorus

d.Oxygen

84. If mercury is used at cathode during the electrolysis of aqueous NaCl the ions discharged at the cathode are

a.hydroxide

b.chloride

c.sodium

d.none of these

85. The exchange of particles considered responsible for keeping the nucleons together are

a.neutron

b.meson

c.positron

d.electron

86. Acid present in the lemon is

a.citric acid

b.tartaric acid

c.acrylic acid

d.lactic acid

87. Which of the following is absorbed by HCl?

a.Methyl alcohol

b.Ethylene

c.Ethanamine

d.Acetylene

88. Carbinol is

a.ethyl alcohol

b.2-propanol

c.1-butanol

d.methyl alcohol

89. Which of the following can reduce Tollens reagent but no Fehlings soln.?

a.Formaldehyde

b.Acetone

c.Benzaldehyde

d.Acetaldehyde

90. In an aqueous solution of sulphuric acid, mole fraction of water is 0.85. The molality of the solution is

a.9.8 m

b.8.9 m

c.7.9 m

d.14 m

91. Aniline condenses with benzaldehyde to give

a.N benzal aniline

b.N benzoyl aniline

c.benzal aniline

d.benzoyl aniline

92. Alcohols have higher boiling point than alkanes of the corresponding molecular mass because

a.alcohols are miscible with water

b.alcohols have ionic bond

c.alcohols have hydrogen bond

d.alcohols contains –OH group

93. Hydrogen bomb is based on the phenomenon of

a.Nuclear fission

b.Nuclear explosion

c.Chemical reaction

d.Nuclear fusion

94. Propene on treatment with dil. sulphuric acid gives

a.2-propanol

b.1-propanol

c.None of above

d.A and B

95. A person requires 2870 Kcal of energy for leading a normal life. If heat of combustion of cane sugar is -1349 Kcal then he must consume……kg of cane sugar daily.

a.728

b.448

c.142

d.224

96. The apparatus used for measuring the heat changes is known as

a.Voltmeter

b.Ammeter

c.Calorimeter

d.Thermometer

97. Equivalent weight of ammonia is

a.31

b.2.7

c.14/3

d.17

98. Ethyl alcohol on treatment with red P and HI under pressure gives

a.acetaldehyde

b.ethyne

c.ethane

d.methane

99. In which of the following octet rule is not applicable?

a.Alkali earth metal

b.Transition elements

c.Alkaline earth metal

d.p-block

100. Calcium acetate on heating gives

a.acetic anhydride

b.pentane

c.acetone

d.ethane

CUET 2026 Chemistry MCQ Question Answers – 100 MCQs for Practice

Chemistry MCQ Question Answers for CUET 2026

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