Question # 1

Contamination of Hg comes into surface water from chlor industrial wastes. Why is Hg toxic

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It attaches to sulphur of the disulphide link

Hg is a heavy metal

Hg is liquid at room temperature

Hg is reactive chemically

The value of oxidation number of chlorine in HCIOs is

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+7

+5

-1

+3

Relationship between volume of a gas and prevailing conditions of temperature and pressure are called

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Gas laws

Equilibrium laws

Rate laws

None of these

The rate of diffusion of a gas is:

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Inversely proportional to its density.

Inversely proportional to square root of its molecules mass.

Directly proportional to molecular mass.

Directly proportional to its density.

Amino acids react together to form the primary structure of proteins which is accompanied by

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addition of water

addition of ammonia

removal of ammonia

removal of water

The fat soluble vitamins are:

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A and B

B and C

C and D

A and D

The system in which all the three axes are unequal and are at righ angle to each other is called

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cubic

hexagonal

orthorhombic

tetragonal

Which factor is helping to reduce the environmental pollution

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Urbanization

Industrialization

Increase of plantation

Rapid growth of population

A polymeric substance that is formed in the liquid state and then hardened to a rigid solid is called a

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fibre

plastic

varnish

polyamide resin

The carbon atom of an alkyl group attached with halogen atom is called

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Electrophile

Free redical

Nucleophile

Nucleophilic centre

Hexamethylene reacts with _______ to prepare nylon 6,6

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acetic acid

adipic acid

formic acid

none of above

What is chrome yellow?

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Pbo

Pb₂O

PbCrO₄

Pb₃O₄

Which of the following are thermoplastic materials

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PVC

Polystyrenes

Polyethylene

All these

The Total coal resources of Pakistan are estimated to be

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184 billion

184 million tones

1.84 billion tounes

1.84 million tonnes

An oil or fat with no double bond have iodine number:

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Zero

100%

50%

Minimum

Strong reducing agents gave

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Greater positive value of standard reduction potential

Greater negative value of standard reduction potential

Lesser positive value of standard reaction potential

None of these

The monomeric units of starch is/are

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Glucose

Fructose

Glucose and fructose

Mannose

Hydrolysis of trichloromethane with aqueous KOH gives

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Potassium formate

Acetylene

Chloral

Methanol

Phosphorus helps the growth of

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Root

Leave

Stem

Seed

Density of aluminium is (g cm^-3):

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B

Al

Si

Ge

Aldehydes can be distinguished from ketones by

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2,4-DNPH test

NaHSO₃test

N₂H₄test

Tollen's test

Borax is a common mineral of alkali metal sodium. Its formula is

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Na₂B₄O₇

Na₂,B₄O₇. 10H₂O

Na₂B₃O₆. 10H₂O

Na₂B₄O₇- 5H₂O

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