Question # 1

If the concentration of salt is greater than the acid in buffer solution, then the

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pH = pKa

pH = pKb

pH > pKa

pH < pKb

Water is made disinfectant during purification of water to the step:

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aeration

coagulation

chlorination

treatment

Site of land for landfill is selected based upon.

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topography

location of ground

water table

All of these

Amorphous substance show

(i) Short and long range order

(ii) Short range order

(iii) Long range order

(iv) Have no sharp melting point

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(i) and (ii) are correct

(ii) and (iv) are correct

(ii) (iii) and (iv) are correct

(i) and (iv) are correct

In the reaction A2 (g) + 4B2 (g) <-----------> 2AB4 (g) such that ∆H < 0, the formation of AB4(g) will be favoured at

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Low temperature and high pressure

Low temperature and low pressure

High temperature and low pressure

High temperature and high pressure

The value of van der Waal s constant a for gases CO₂, N₂, and SO₂, are 3.59 ,1.39, 1.36, and 6.17 atm dm⁶ mol^-2respectively the gas which can be most easily liquefied is

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CO₂

O₂

N₂

SO₂

What is distilled first?

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Liquid CO₂

Liquid N₂

Liquid O₂

Liquid H₂

Which one of the following is an organic compound?

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Calcium carbide

Calcium cyanide

Carbon disulphide

None of these

Coal contains percentage of sulphur:

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1-9%

5-9%

6-9%

7-9%

Which of these has at least one d electron

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Sc+3

Mn+7

Ti+4

Cr+3

How many secondary carbon atoms are present in Methylcylopropand

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1

2

3

0

Which reaction sequence would be best to prepare 3-chloro-aniline from benzene?

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Chlorination, nitration, reducing

Nitration, chlorination, reducition

Nitration, reduction,chlorination

Nitration, reduction, acylation, chlorination, hydrolysis

Elimination bimolecular reactions involve:

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First order Kinetics

Third order kinetics

Zero order kinetics

Platinum is poisoned by

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Arsenic

Silver

Argon

Zinc

Best way to prevent rusting of iron is by

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Making iron cathode

Putting it in saline water

Both of these

None of these

Which statement is true about order of reaction :

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Order of reaction can only be determined by an experiment.

Order of reaction can be determined from a balance equation only.

Order of reaction increase by increasing temperature.

Order of reaction must be in whole number and not in fraction.

A single chloride free radical can destroy bow many ozone molecules?

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100

100000

10000

10

Which is not the condition for the formation of smog

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There must be sufficient NO gas

There must be sunlight to help photo chemical reaction to take place

Air must be blowing swiftly

There must be SO₂in the air

Which one of the followings is a heterocyclic compound

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Cyclohexanol

Phenol

Pyridine

Anthracene

Law of mass action was given by :

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Guldberg and Waage.

Berkeley and Hartly.

Ramsay and Reyleigh.

Berthelot.

Monosaccharides belong to the group

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Lipids

Fats

Proteins

Carbohydrates

Reaction of acids with alcohols is also known as

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Esterification

Saponification

Alkalization

None

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