CUET 2023 Chemistry MCQs 100 Questions for CUET Exam

Chemistry MCQ Question Answers for CUET 2023

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 2023 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.

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

a.increases only if the products are gaseous

b.is not affected

c.increase considerably

d.decreases

2. RCOCl reacts with R MgBr to yield

a.tertiary alcohol

b.primary alcohol

c.ketone

d.secondary alcohol

3. Nobels oil is

a.trinitroglycol

b.glycerol trinitrate

c.dinitro glycerine

d.glycerol

4. Mesitylene is

a.2, 3, 5 trimethyl benzene

b.1, 3, 5 trimethyl benzene

c.1, 3, 4 trimethyl benzene

d.2, 2, 4 trimethyl benzene

5. 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

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

a.5 gm mole

b.1 mole gm atom

c.3 mole

d.1 gm equivalent

7. In neopentane the number of primary carbon atoms are

a.4

b.5

c.1

d.2

8. Which of the following has minimum boiling point?

a.both A and B

b.n-pentane

c.neopentane

d.isopentane

9. Williamsons synthesis is used for preparing

a.amines

b.alcohol

c.ester

d.ether

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

a.2-propene

b.1-propanol

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

d.1-propene

11. Bromination of isobutene gives as major product

a.isobutyl bromide

b.None of the above

c.n-butyl bromide

d.tert. butyl bromide

12. 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.224

b.448

c.142

d.728

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

a.9

b.3

c.15

d.2

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

a.90 degree

b.96 degree

c.180 degree

d.144 degree

15. 75% of a radioactive element disintegrates in 6 days. Its half-life is

a.6 days

b.18 days

c.2 days

d.3 days

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

a.ethyl acetate

b.methyl methanoate

c.formic acid

d.propyl methanoate

17. 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

18. Which of the following has dipole moment?

a.1-propene

b.Both A and B

c.trans-2-butene

d.cis-2-butene

19. Equilibrium constant changes with

a.temperature

b.time

c.pressure

d.both temperature and concentration

20. Acetic acid exists as dimer in benzene due to

a.presence of hydrogen atom at α-carbon

b.presence of carbonyl group

c.condensation reaction

d.hydrogen bonding

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

a.All the above

b.triphenyl methyl

c.diphenyl methyl

d.benzyl

22. Schiffs bax is obtaind by the action of

a.All the above

b.p-amines with acid anhydrides

c.p-amines with aldehydes

d.p-amines with acid chloride

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

a.independent of the conc.

b.inversely proportional to the conc.

c.directly proportional to the initial conc.

d.directly proportional to cube of the conc.

24. The bond angle in ammonia is

a.99 degree

b.107 degree

c.106 degree

d.110 degree

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

a.1% aqueous solution of sodium chloride

b.1% aqueous solution of fructose

c.1% aqueous solution of urea

d.1% aqueous solution of methyl alcohol

26. Ammonium acetate on heating decomposes to give

a.acetylamine

b.formamide

c.amine

d.acetamide

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

a.electron attracting group

b.electron repelling group

c.All the above

d.free radical

28. Amongst HX, the maximum dipole moment is of

a.HBr

b.HCl

c.HI

d.HF

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

a.1

b.0

c.2

d.4

30. All the radioactive changes are of

a.Zero order

b.Second order

c.Third order

d.First order

31. Shape of the carboxyl group is

a.tetrahedral

b.pyramidal

c.planar triangular

d.octahedral

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

a.70 min

b.50 min

c.125 min

d.105 min

33. Hydrogen bomb is based on the phenomenon of

a.Nuclear fission

b.Chemical reaction

c.Nuclear fusion

d.Nuclear explosion

34. Calcium acetate on heating gives

a.acetic anhydride

b.pentane

c.acetone

d.ethane

35. The hydrogen halide which has maximum boiling point is

a.HF

b.HBr

c.HI

d.HCl

36. In isopentane the number of secondary carbon atom is

a.2

b.1

c.3

d.0

37. Propene on treatment with dil. sulphuric acid gives

a.A and B

b.1-propanol

c.None of above

d.2-propanol

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

a.polar covalent bond

b.hydrogen bond

c.ionic bond

d.Van der Waals interaction

39. Carbinol is

a.methyl alcohol

b.1-butanol

c.2-propanol

d.ethyl alcohol

40. Heisenberg test can be used to distinguish between

a.primary amines, secondary amines and tertiary amine

b.primary amines and tertiary amines

c.All the above

d.primary amines and secondary amines

41. An azeotrope is one that

a.can be separated by distillation above critical solution temperature

b.can be separated by distillation below critical solution temperature

c.can be separated by distillation at critical solution temperature

d.cannot be separated by distillation

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

a.value of rate constant increases

b.number of collisions get doubled

c.activation energy increases

d.energy of activation decreases

43. 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

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

a.some are solid at room temperature

b.energy of activation differs from one reaction to another

c.all the above

d.some are coloured

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

a.silver nitrate is insoluble in water

b.the reaction is instantaneous

c.solubility of silver nitrate increases with sodium chloride

d.silver chloride is sparingly soluble in water

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

a.Oxalic acid

b.Acetic acid

c.Butyric acid

d.Citric acid

47. Art of electroplating was enunciated by

a.Brugantally

b.Einstein

c.Kohlorausch

d.Ampere

48. Wurtz reaction cannot be used for the preparation of

a.methane

b.alkanes containing odd no. of C-atoms

c.alkanes containing even no. of C-atoms

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

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

a.7

b.3

c.5

d.6

50. An electrophile is a/an

a.Both A and B

b.electron deficient species

c.Lewis base

d.Lewis acid

51. Which of the following is absorbed by HCl?

a.Ethanamine

b.Ethylene

c.Methyl alcohol

d.Acetylene

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

a.nitro compound

b.benzene

c.azo compound

d.diazo compound

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

a.same nuclear charge

b.nuclear charge lower by one unit

c.lower nuclear charge

d.nuclear charge higher by one unit

54. Equivalent weight of ammonia is

a.2.7

b.31

c.14/3

d.17

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

a.Ammeter

b.Voltmeter

c.Calorimeter

d.Thermometer

56. Once the equilibrium is reached under given condition:

a.Conc. of reactants remains same

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

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

d.Conc. of products remains same

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

a.none of these

b.sodium

c.hydroxide

d.chloride

58. Vinegar contains

a.19% acetic acid

b.10 to 12% acetic acid

c.100% acetic acid

d.7 to 8% acetic acid

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

a.as radioactive as the radium content

b.thrice as radioactive as the radium content

c.half as radioactive as the radium content

d.no longer radioactive

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

a.1 propanal

b.Methoxy ethane

c.2 methyl propane

d.2 methanal

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

a.7.9 m

b.8.9 m

c.9.8 m

d.14 m

62. A mole of electrons is the same as

a.ampere-second

b.faraday

c.one

d.curie

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

a.5

b.16

c.24

d.6

64. Which of the following will have maximum entropy?

a.Helium

b.Diamond

c.Silver

d.Argon

65. 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.2.2

b.0.9

c.0.09

d.1.1

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

a.Potassium-Argon method

b.Uranium lead method

c.Radium-silicon method

d.Carbon 14 dating method

67. Radio-activity was discovered by

a.J.J. Thomson

b.Madame Curie

c.Henry Becquerel

d.Rutherford

68. In the case of exothermic reactions equilibrium constant K

a.increases with pressure

b.remains unchanged with temperature

c.depends on the nature

d.decreases with temperature

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

a.Nitrogen

b.Iodine

c.Oxygen

d.Phosphorus

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

a.15

b.35

c.86

d.46

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

a.inhibitor

b.promoter

c.induced catalyst

d.autocatalyst

72. 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.500 cal/gm

b.500 cal/mol

c.-44.2 Kcal/mol

d.-21.12 Kcal/mol

73. Acid present in the lemon is

a.acrylic acid

b.citric acid

c.lactic acid

d.tartaric acid

74. Aniline condenses with benzaldehyde to give

a.N benzoyl aniline

b.N benzal aniline

c.benzal aniline

d.benzoyl aniline

75. Formic acid is prepared by distilling glycerol with

a.tartaric acid at 10 degree Centigrade

b.lactic acid at 50 degree Centigrade

c.oxalic acid at 240 degree Centigrade

d.oxalic acid at 110 degree Centigrade

76. The chemical system in equilibrium is not affected by

a.changing the temperature

b.increase in the concentration of reactants

c.change in the concentration of products

d.addition of a catalyst

77. In the case of o-chlorophenol there exist

a.intermolecular covalent bonding

b.intramolecular hydrogen bonding

c.both inter and intramolecular hydrogen bonding

d.no hydrogen bonding

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

a.Acetone and chloroform

b.Benzene and toluene

c.Acetone and ethyl alcohol

d.Ethyl alcohol and cyclohexane

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

a.Acetone

b.Acetaldehyde

c.Formaldehyde

d.Benzaldehyde

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

a.b.pt increases

b.m.pt. decreases

c.density decreases

d.f.pt. decreases

81. Calcium formate of heating gives

a.formic acid

b.formaldehyde

c.banzaldehyde

d.methanoic anhydride

82. 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

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

a.p-amine

b.quaternary salt

c.tert. amine

d.secondary amine

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

a.meson

b.positron

c.electron

d.neutron

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

a.M energy level

b.L energy level

c.K energy level

d.N energy level

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

a.alcohols have ionic bond

b.alcohols contains –OH group

c.alcohols have hydrogen bond

d.alcohols are miscible with water

87. Schiffs base on reduction give

a.sec. amine

b.aniline

c.tert. amine

d.p-amine

88. Which will have the maximum solubility in water?

a.Methanol

b.1 butanol

c.Isobutyl alcohol

d.Tert. butyl alcohol

89. Which of the following is a carcinogen?

a.Aniline

b.Ethyl amine

c.N-nitroso amine

d.Benzenediazonium chloride

90. 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

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

a.9

b.27

c.36

d.5

92. Which of the following is a sedative?

a.Paraformaldehyde

b.Metaldehyde

c.Benzaldehyde

d.Paraldehyde

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

a.acetaldehyde

b.ethane

c.methane

d.ethyne

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

a.none of the above

b.Adiabatic

c.Isobaric

d.Isothermal

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

a.is constant

b.decreases

c.is zero

d.increases

96. Salt Bridge is used because it

a.provides the extra ions

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

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

d.maintains the electrical neutrality of the two half cells

97. The maximum number of molecules are in:

a.36 gram of water

b.14 gram of carbon dioxide

c.48 gram of ethyl alcohol

d.52 gram of nitrogen peroxide

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

a.Alkaline earth metal

b.Transition elements

c.p-block

d.Alkali earth metal

99. 1 Joule is equal to

a.0.04184 Cal

b.1.390 Cal

c.2.39 Cal

d.0.239 Cal

100. Shape of amines is

a.square planar

b.planar triangular

c.pyramidal

d.tetrahedral

CUET 2023 Chemistry MCQ Question Answers – 100 MCQs for Practice

Chemistry MCQ Question Answers for CUET 2023

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