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NAT I Engineering Chemistry MCQs With Answers

Question # 1

Octane number is zero for

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n-Heptane

Isooctane

n-Hexane

Isoheptane

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Question # 2

Among alkali metal salts,the lithium salts are the poorest conductors of electricity in aqueous solution because of

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Easy diffusion of Li⁺ ions

Lower ability of Li⁺ ions to polarize water molecules

Lowest charge to radius ratio

Higher degree of hydration of Li⁺ ions.

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Question # 3

Which of the following with aqueous KOH will give acetaldehyde?

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1,2-Dichloroethane

1, 1-Dichloroethane

Chloroacetic acid

Ethyl chloride

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Question # 4

Which of the following elements is most electronegative?

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Oxygen

Chlorine

Nitrogen

Fluorine

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Question # 5

The ratio of the ionization energy of H and Be³⁺ is

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1 : 1

1 : 3

1 : 9

1 : 16

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Question # 6

Detergents are

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Synthetic products

Natural products

Both A and B

None of the above

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Question # 7

Which of the following mineral does not contain AI?

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Cryolite

Mica

Feldspar

Fluorspar

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Question # 8

The carbon atoms in calcium carbide are held by

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Ionic bonds

2 sigma bonds

2 covalent one co-ordinate bond

2 π and one σ bond

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Question # 9

In the manufacture of iron from haematite,limestone is added to act as.

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Flux

A reducing

Slag

An oxidizing agent.

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Question # 10

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 # 11

When pressure is applied to the equilibrium system Ice Water Which of the following phenomenon will happen?

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More ice will be formed

Water will evaporate

More water will be formed

Equilibrium will not be formed

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