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NAT I Engineering Chemistry MCQs With Answers

Question # 1

Wholer prepared ures from

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Ammonia

NH₄CNO

NH₃

uric acid

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Question # 2

Saturated solution of NaCI on heating becomes

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Super saturated

Unsaturated

Remains saturated

None

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Question # 3

Which is true for an element R present in group 13 of the periodic table?

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It is a gas at room temperature

It has oxidation state of +4

It forms R₂O₃

It forms RX₂

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Question # 4

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 # 5

One mole of a gas refers to

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The number of molecules in one litre of gas

The number of molecules in one gram of gas

The number of molecules contained in 12 grams of ¹²C isotope

The number of molecules in 22.4 liters of a gas at S.T.P.

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Question # 6

The number of unpaired electrons in the P-subshell of oxygen atom

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Question # 7

The alkali metal which is liquid at 15°C is

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None

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Question # 8

The mass of the neutron is of the order of

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10^-23 kg

10^-24 kg

10^-26 kg

10^-27 kg

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Question # 9

Addition of iron filling to CuSO₄solution caused precipitation of Cu awing to the

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Reduction of Cu²⁺

Oxidation of Cu²⁺

Reduction of Fe

Reduction of Fe³⁺

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Question # 10

The ratio of close packed atoms to tetrahedral holes in cubic close packing is

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1 : 1

1 : 2

1 : 3

2 : 1

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Question # 11

Enzymes are

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Proteins

Mineral

Oils

Fatty acids

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