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NAT II Biological Science Chemistry MCQs With Answers

Question # 1

Minamata disease is due to pollution of

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Organic waste

Oil spill in water

Industrial waste containing mercury into fishing water

Arsenic into the atmosphere

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Question # 2

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

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Mojarity

Molality

Mole fraction of solute

Mole fraction of solvent

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Question # 3

Phosphorus pentoxide finds use as

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An oxidizing agent

A reducing agent

a bleaching agent

A dehydration agent.

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Question # 4

Outermost shells of two elements X and Y have two and six electrons respectively. If they combine, the expected formula of compound will be

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X₂Y

X₂Y₃

XY₂

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Question # 5

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

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Question # 6

Which of the following geometry is associated with the compound in which the central atom assumes sp³d hybridization?

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Planar

Pyramidal

Angular

Trigonal bipyramidal

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Question # 7

The formula of nitre is

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KNO₃

NANO₂

NaCl

Na₂CO₃

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Question # 8

The number of atoms contained in 11.2 L of SO₂at S.T.P are

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3/2 x 6.02 x 10²³

2 x 6.02 x 10²³

6.02 x 10²³

4 x 6.02 x 10²³

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Question # 9

Water (H_2O) is liquid while hydrogen sulphide (H₂S) is a gas because

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Water has higher molecular weight

Hydrogen sulphide is a weak acid

Sulphure has high electronegativity than oxygen

Water molecules associate through hydrogen

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Question # 10

Which one of the following compounds does not exist?

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NCl₅

AsF₅

SbCl₅

PF₅

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Question # 11

The addition of HBr is easiest with

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CH2 = CHCl

CICH = CHCl

CH3 - CH = CH2

(CH3)2 C = CH2

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