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NAT I Engineering Chemistry MCQs With Answers

Question # 1

Which one of the following elements occurs free in nature?

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Question # 2

Bragg's law is given by equation

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n λ = 2 θ sin θ

n λ = 2 d sin θ

2nλ = d sin θ

nλ = 1/2 d sin θ

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Question # 3

The number of oxygen atoms in 4.4 g of CO₂ is approximately

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1.2 x 10²³

6 x 10²²

6 x 10²³

12 x 10²³

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Question # 4

Bleaching action of bleaching powder is due to the liberation of

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O₂

OCI^-

CI₂

CI^-

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Question # 5

The number of atoms in 0.0004 g of magnesium is close to

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2 x 10²⁰

10²⁰

6.02 x 10²³

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Question # 6

Which of the following is a colligative property?

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Melting point

Osmotic pressure

Freezing point

Sublimation temperature

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Question # 7

Which of the following cannot be produced by acidic dehydration of alcohols?

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Ethers

Aldehyde

Alkyl Hydrogen sulphate

Alkene

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Question # 8

Which of the following substances is used as an antiknock compound?

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Tetraethyl lead

Lead tetrachloride

Lead acetate

Ethyl acetate

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Question # 9

Which of the following alkali metal hydroxides is the strongest base?

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LiOH

NaOH

KOH

CaOH

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Question # 10

All the naturally occurring processes proceed spontaneously in a direction which lead to

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Decrease of entropy

Increase of enthalpy

Increase of free energy

Decrease of free energy

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Question # 11

Leblanc process is employed in the manufacture of

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Baking soda

Washing soda

Potash

Plaster of paris

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