Question # 1

The boiling point of glycerin at 1 atmospheric pressure is:

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290°C

390°C

190C°

210°C

The average bond energy of C-Br is

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228 kJmol-1

250 kJmol-1

200 kJmol-1

290 kJmol-1

pH of 10-4 mole dm-3 of HCl

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2

4

3

5

The reason of acid rain is:

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release of CO in excess by in complete combustion

excess release of NO₂ and SO₂ from burning of fossil fuels

Formation of NH₃ in excess form industry and coal gas

Formation of excess CO₂ due to combustion and respiration

Polysaccharides are

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Polyester

Polyamides

Poly ethers

Polynucleotide

How should the conditions be changed to prevent the volume of a given gas from expanding when its mass increased?

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temperature and pressure both ara increased

temperature and pressure both are lowered

temperature is lowered and pressure is increased

temperature is increased and pressure is descreased

Cholesterol is a precursor of steroid hormones. Choose the class of steroid

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A carbohydrate

A hydrocarbon

A natural lipid

A protein a hydrocarbon

Formamide is formed by the reaction of which acid with ammonia

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Oualic acid

Formic acid

Ethanoic acid

Propanoic acid

The rate of diffusion of a gas of molar mass 72 as compared to H₂will be:

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Same

6 times

1.4 times

1/6 times

Which of the following are thermoplastic materials?

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PVC (poly vinyl chloride)

polystryences

polyethylene

all above

Which of the following is the element not present in all proteins?

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Carbon

Hydrogen

Nitrogen

Sulphur

When an electric current is passed through discharge tube at low pressure, cathode rays are emitted from cathode these rays consist of:

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Alpha rays.

Negative particles.

Electromagnetic rays.

Positive particles.

Which of the following oxides is amopheric in character?

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CaO

CO₂

SiO₂

SnO₂

If two lone pairs are present then bond angle of tetrahedral compound reduces to ______ degrees

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109.5°

107.5°

104.5°

None

Ricket is caused due to the deficiency of vitamin

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A

D

B

E

Pakistan in the beginning was a country :

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Industrial

Chemical

Agrarian

Technologies

Which of the following is an ortho-para directing group

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In the ground state of an atom, the electron is present:

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In the nucleus.

In the second shell.

Nearest to the nucleus.

farthest from the nucleus.

Alkanes are gases :

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C₁-C₄

C₅-C₁₀

C₁₁-C₁₅

C₁₀-C₂₀

An example of water soluble vitamin is

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Vitamin D

Vitamin E

Vitamin A

Vitamin C

With increases of 10°C temperature the rate of reactiondoubles. This increase in rate of reactionis due to :

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Decrease in activation energy or reaction.

Decrease in number of collisions between reactant molecules.

Increase in activation energy of reactants.

Increase in number of effective collisions

Fe can displace Cu form CuSO4solution because

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Fe is ferromagnetic

Fe is below Cu in electrochemical series

Fe is above Cu in electrochemical series

Fe exists in divalent oxidation state

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