Chemistry MCQ Questions Answer Download PDF Objective Practice Set

31) pH value of neutral solution is—

a) 8

b) 5

c) 7

d) 13

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Option – c)

32) Acid reach with bases to give—

a) ester

b) Alcohol

c) Salt

d) None

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Option – c)

33) If the vapour denisty of a gas is molecular mass will be—

a) 12

b) 16

c) 18

d) 28

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Option -d)

34)The biocatalysts are—

a) Enzymes

b) Minerals

c) Plants

d) All proteins

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Option -a)

35)Which fuel has the maximum calorific value—

a) Charcoal

b) Kerosene

c) Wood

d) Cow-dung

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Option -b)

36)Which law of thermodynamics introduces the concept of entropy—

a) First law

b) Zeroth law

c) Third law

d) Second law

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Option – d)

37)Which among the following has the highest ionization potential—

a) Li

b) B

c) Ne

d) F

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Option – c)

38) The element that has the highest first ionization potential is—

a) Boron

b) Nitrogen

c) Oxygen

d) Carbon

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Option -b)

39)The most powerful reducing agent is—

a) K

b) Ba

c) Na

d) Mg

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Option -a)

40)Reverse of swelling of gel is known as—

a) Syneresis

b) Thixotropy

c) Sorption

d) None of these

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Option – a)

41)Which of the following is mixture ?

a) Distilled water

b) Gasoline

c) Liquified petroleum gas

d) Both (b) , (c)

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Option -d)

42) Diamond is _

a) An element

b) A compound

c) A mixture

d) A liquid

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Option -a)

43) The product of equivalent weight and valency of an element is equal to _

a) Vapour density

b) Specific heat

c) Atomic weight

d) Molecular weight

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Option – c)

44) The most abundant metal in earth crust is _

a) Iron

b) Magnesium

c) Calcium

d) Aluminium

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Option -d)

45) The isotopes of chlorine with mass number 35 and 37 exist in the ratio of _

a) 1 :2

b) 2 :3

c) 3 : 1

d) 3 :4

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Option – c)