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NAT I Engineering Chemistry MCQs With Answers

Question # 1

Which one is the property of an ideal solvent

Choose an answer

Should be expensive

It should react chemically with the solute

Impurities should crystallize along with the solute

Should be safe to use

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Question # 2

In Friedal-Craft's alkylation besides AICI3 the other reactants are

Choose an answer

C6H6 + NH3

C6H6 + CH4

C6H6 + CH3CI

C6H6 + CH3COCI

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Question # 3

A certain liberate 0.5 g of hydrogen in 2 h. How many grams of copper can be liberated by the same current flowing for the same time in a copper sulphare solution?

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12.7 gm

15.9 gm

31.8 gm

63.5 gm

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Question # 4

In cold countries ethylene glycol is added to water in radiators of cars during winter It result in

Choose an answer

Lowering in b.pt.

Reducing viscosity

Reducing specific heat

Lowering in freezing pt.

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Question # 5

If the solvent is inflammable for heating purpose we use

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Ice bath

Water bath

Wire gauze

Thermostat

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Question # 6

The substance used as a smoke screen in warfare is

Choose an answer

SiCI₄

PH₃

PCI₅

Acetylene

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Question # 7

The molal elevation constant is the ratio of the elevation in boiling point to

Choose an answer

Molarity

Molality

Mole fraction of solute

Mole fraction of solvent

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Question # 8

Wholer prepared ures from

Choose an answer

Ammonia

NH₄CNO

NH₃

uric acid

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Question # 9

Cyclone collector is used for minimizing

Choose an answer

Radioactive pollution

Air pollution

Noise pollution

Water pollution

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Question # 10

By using the fluted filter paper rate of filtration is

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Increased

Decreased

Filtration is constant

Having no effect

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Question # 11

The valence orbital configuration of an element with atomic number 23 is

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3d⁵

3d³, 4s²

3d³,4s¹,4p¹

3d²,4s²,4p¹

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