Question # 1

Phosphorus is very useful in the growth of:

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leave

stem

seed

root

Furan is a compound

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Acyclic

Alicyclic

Heterocyclic

non-aromatic

What change in plants indicates toxic effect of SO₂

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Weathering of leaves

Darkening of leaves

Falling of leaves

Bleaching of leaves

The reaction of formaldehyde with HCN is

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Nucleophilic substitution

Electrophilic substitution

Nucleophilic addition

Free radical addition

Silk is an example of

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animal fiber

vegetable fibre

mineral fibre

none of these

Which of the following statements is incorrect about vitamins

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often function as coenzymes

molecules contain at least one ring structure

are often synthesized by the body

are polyfunctional compounds

The process of effusion is best understood by law

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Grahams

Boyle s

Charles s

Avogadro s

The volume of 2.8 g of CO at 27°C and 0.0821 atm is

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30 dm³

3 dm³

0.3 dm³

1.5 dm³

Denaturation of protein means the structure of protein is distrupted. indicate which factor does not denature protein

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heating protein

pH changes

oxidising agent

keeping pH 7.35

Glucose is converted into ethanol by the enzyme present in the yeast

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Urease

Zymase

Invertase

Sucrase

Given data

(i) heat of formation of CO₂is -393.7 KJ mole^-1

(ii) heat of formation of H₂O is -285.8 KH mole^-1

(iii) heat of combustion of CH_{4 is -890.00 KJ mole}^-1

Enthalpy of formation of methane from C and H₂is calculated by Hess's law by

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Adding i + ii + iii

Adding 2(i) and ii and subtracting iii

adding i + iii and subtracting ii

Adding i + 2(ii) and subtracting iii

How many moles of hydrogen atoms does 3.2 g of methane, CH₄, contain?

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0.02

0.2

0.4

0.8

The reaction of 4-bromobenzyl chloride with NaCN in ethanol leads to

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4-Bromobenzyl cyanide

4-Cyanobenzyl chloride

4-Cyanobenzyle cyanide

4-Bromo 2-cyanobenzyl chloride

Among the following polymers, the strongest molecular forces are present in

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Elastomers

Fibres

Thermoplactics

Thermosetting polymers

The volume of 0.1 M H₂SO₄required to neutralize completely 40 ml of 0.2 M NaOH solution is

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10 ml

40 ml

20 ml

50 ml

Benzene is an example of

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Aromatic compound

Cyclic compound

Aliphatic compound

A cyclic compound

Geographical survey of Pakistan estimates about billion tons of coal in Pakistan:

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182

183

184

185

Gypsum is a common mineral of

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Magnesium

Strontium

Calcium

Barium

The entropy of the universe

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Constant

Is equal to zero

Decreasing

Increasing

Methyl alcohol is not used

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As a solvent

A an anti-freezing agent

As a substitute for petrol

For denaturing of ethyl alcohol

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