Question # 1

Which is unnecessary for purification of water for drinking purposes

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Coagulation

Aeration

Treatment with Iodine

Treatment with chlorine

Photochemical smog consists of higher concentration of:

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Oxidants

Ozone

a & b

NO₃

One of the following is not a biopolymer,Point out that one:

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lipid

starch

diamond

protein

Biochemical oxygen demand (BOD) is the capacity of organic matter in natural water to consume oxygen with in a period of:

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2 days

6 days

5 days

7 days

At different temperature, the vapour pressure of water is

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different

same

low

high

The temperature of a gas is directly proportional to its

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average translational kinetic energy

enthalpy

internal energy

hydration energy

The concentration of dissolved molecular oxygen in water which acts as the most important oxidizing agent ranges form:

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2ppm - 6ppm

2ppm - 4ppm

4ppm - 8ppm

2ppm - 3ppm

At present the number of cement factories is Pakistan are

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20

22

25

30

Which method is not used in preparation of acetic acid?

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Oxidation of ethane

Hydrolysis of ethyl acetate

Reaction of CO₂with CH₃MgX

Oxidation of methane

In an electrochemical series, elements are arranged on the basis of

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pH scale

pKa scale

pOH scale

Hydrogen scale

In gasses and liquid, temperature is the measure of:

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Average transnational kinetic energies of molecules.

Average vibrational kinetic energies of molecules.

Average rotational kinetic energies of molecules.

None of above.

Electronegativity values of the elements F, CI and Br vary

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F > CI > Br

Br > CI > F

Cl > Br > F

CI > F > Br

The shape of methanol, ammonia and water molecule can be explained by assuming

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Sp³hybridization

Sp²hybridization

Sp hybridization

All of these

The widely used nitrogen fertilizer that contains about 46% nitrogen is

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Ammonia

Ammonium nitrate

Ammonium sulphate

Urea

The order of distance between the various Bohr orbits is

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r₂- r₁> r₃- r₂> r₄- r₃> ......

r₁> r₂> r₂- r₃> r₄-r₃> .....

r₂-r₁= r₃- r₂= r₄- r₃> .....

r₂- r₁> r₃- r₂< r₄- r₃< ....

The OH group present in acids may be replaced by CI atom on treatment with

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PCI₅

SOCI₂

Both of them

None of the above

Pressure volume work is

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Angle 120° is observed in molecules :

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CH₄

CH_3-CH₃

CH -CH

CH_{2 =}CH₂

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

All reactions occur in :

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A single step.

A series of steps

Two steps.

Both (a) and (b)

Ozone depletion in stratosphere shall result in

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Forest fires

Increased incidence of skin cancer

Global warming

None of the above

Exposure to CO results in

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Headache

Fatigue

Unconsciousness

All of these

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