Question # 1

If R, T, M, V and P are gas constant, temperature, molar mass, volume and pressure then density is given by:

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M/V

RT/M

PM/RT

V/M

The radioactive disintegration of 238U92 is

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First order

Second order

Third order

Zero order

Which of the following air pollutant is called quiet killer

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PAN

CO

NO₃

SO₃

Plastics are a pollution problem because many plastics:

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Are made from petroleum

Are very inflammable

Burn to produce toxic fumes

Decompose to produce toxic products

Oxides of sulphur react in atmosphere by various reactions to form:

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sulphates

sulphites

sulphides

sulphate aerosols

The maximum hydrogen bonding is in:

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diethyl ether

ethanol

water

benzene

One atmosphere is equal ___________ Pascal

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760

101325

14.7

1.01325

Which of the following is not the required condition for the formation of smog

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Sufficient NO

Sunlight

Less movement of air

Winds

The gases H₂, O₂, H₂S and SO₂diffuse in the order

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SO₂>H₂S>H_2>O₂

H₂S>SO₂>O₂>H₂

O₂>SO₂>H₂>H₂S

H₂>O₂>H₂S>SO₂

During sudden expansion of a gas energy is needed to overcome the intermolecular:

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Vibrations

Attractions

Repulsions

All of above

In a group, the atomic radii from top to bottom

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increase

decrease

don't change

show variable trend

d-block elements closely resemble in their physical and chemical properties. Which statement is incorrect

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They show variable valency

Their ions and compounds are coloured

They are good conductors of heat and electricity

Their compounds are diamagnetic

Value of chemical oxygen demand (COD) is a measure of chemically oxidizable matter in water. Which value of COD will indicate more polluted water

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Low value

Higher value

Both values

None of these

Potassium chromate has formula

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KClO₃

K₂CO₃

K₂CrO₄

K₂Cr₂O₇

Catalytic oxidation of alkanes is used for the preparation of

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Adehydes

Ketones

Fatty acid

Carbonyylic acids

Synthetic rubber is made by polymerization of

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Chloroform

Acetylene

Divinlacetylene

Butene

DDT is formed from

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Benzene and Chlorobenzene

Chloral and Chlorobenzene

Chloral and Benzene

Chlorobenzene and chlorine

Which of the following sets of atomic numbers belong to that of the alkali metals?

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1,12,30,4,62

37,19,3,55

9,17,35,53

12,20,56,88

The substance added in the paints for improving the mechanical properties is called

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Pigment

Filter

Stabilizer

Binder

When sulphur is boiled with Na₂SO₃solution, the compound formed is

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Sodium sulphides

Sodiums sulphates

Sodium persulphate

Sodium thiosulphate

Grignard's reagent on treatment with dry CO₂and HCI yields

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Ester

Alcohol

Carboxylic acid

Aldehyde

One of the following bonds is polar but compound is non-polar

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H₂O

NH₃

HCl

CO₂

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