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NAT I Engineering Chemistry MCQs With Answers

Question # 1

In which of the following elements +1 oxidation state is more stable than +3

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Question # 2

The movement of solvent molecules through a semipermeable membrane is called

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Electrolysis

Electrophoresis

Osmosis

Cataphoresis

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Question # 3

When electrons revolve is stationary orbits

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There is no change in energy level

They vecome stationary

They are gaining kinetic energy

There is increase in energy

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Question # 4

Natural frertilizer provides phosphorus to plants in the form of P₂O₅

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1.2 kg

2.2 kg

3.2 kg

4 kg

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Question # 5

Which of the following imparts violet colouration to the non-luiminous flame of Bunsen burner?

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NaCI

BaCI₂

CaCI₂

KCI

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Question # 6

Most common reactions of benzene and its derivatives are

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Electrophilic addition reactions

Electrophilic substitution reactions.

Nucleophilic addition reactions

Nucleophilic substitution reactions

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Question # 7

Gooch crucible is used for the filtration of precipitates having

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High solubility

High concentration

High ignition temperature

Low temperature

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Question # 8

During the folding of filter paper the apex form angle of about

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80^o

60^o

180^o

90^o

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Question # 9

Octane number can be changed by

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Isomerisation

Alkylation

Cyclisation

All of these

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Question # 10

Salol is prepared from

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Salicylic acid and phenol

Salicylic acid and methyl alcohol

Both

None

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Question # 11

The structure of XeF₆

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Distorted octahedral

Pyramidal

Tetrahedral

None of the above

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