Question # 1

All of the following substances are crystalline except:

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carbon

ice

plastic

sucrose

The electrochemical series is based on

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pH scale

Redox scale

Hdrogen scale

Arrhenius scale

Which one of the following is a water soluble vitamin?

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niacin

rioflavin

trypsin

ascorobic acid

pH of an aqueous solution is 3.0 at 25°C. The hydrogen ion concentration in the solution would be

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0.001

0.01

0.0001

10(-5)

Pyridine is an example af

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Homocyclic compound

Heterocyclic compound

Carbocyclic compound

Aliphatic compound

Under which condition CO has the maximum molar volume.

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high T and P

Low T and High p

high T and low pressure

Low T and low P

Which of the following gases have maximum root mean square velocity at 25°C:

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SO₂

NH₃

CO₂

H₂S

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

Which of the following is pure substance

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Distilled water

, Sea water

, NaCl (aq)

Brass

Observed pressure of gas on the walls of container is less than actual pressure due to

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Hephazard motion

Inter molecular attractive forces

Elastic collision

Repulsive forces

Vapour pressure of a liquid is more if

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the intermolecular forces between the molecules of the liquid are strong

the intermolecular forces between the molecules of the liquid are weak

more liquid is present in a container

liquid has more surface area to evaporate

Which of the following alcohols cannot be produced by treatment of aldehydes or ketones with NaBH₄or LiAIH₄?

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1-propanol

2-propanol

2-Methyl-2-propanol

Ethanol

Which are used as essences(flowers)?

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aldehydes

Ketones

alcohols

esters

The solution left after the formation of crystals is called :

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Residue.

Filtrate.

Mother liquor.

None of these.

Ammonia like water also reacts with Grignard's reagent to give

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Alkane

Alkene

Alkyne

Amide

The example of a photo chemical reaction is photosynthesis has order of reaction :

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1

2

0

3

Interstitial compounds have

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Half formula

Fixed formula

Indefinite formula

None

Freezing point depression is measured by

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Beckmann's apparatus

Lands Berger's method

Antifreeze apparatus

All of the above

The number of paper industries in Pakistan are

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30

25

35

20

Mass of simple electron is:

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9.1 x 10^-31 kg

9.1 x 10^-30 kg

1.66 x 10^-31 kg

9.1 x 10^-31 kg

Pressure volume work is

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Which one of the following substance is no used as drying agent in desiccators

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Silica gel

CaCl₂

Phosphorous

NaCL(50%)

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