Question # 1

Plastics are 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

Beryllium differs from other elements of group Il-A due to

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high charge density

comparatively high nuclear charge

small radius

all above

Which one of the following is not a component of environment:

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biosphere

stratosphere

hydrosphere

lithosphere

Coagulation removes suspended particles in ran water:

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60%

70%

80%

90%

A real gas obeying van der Waals equation will resemble ideal gas if

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Both a and b are large

a is large and b is small

Both a and b are small

a is small and b is large

If the energy of the activated complex lies close to energy of reactants, it means that reaction is

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Slow

Exothermic

Endothermic

Exothermic and fast

The nature of l₂crystals are

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Metallic

Covalent

Ionic

Molecular

Structure of CrO4(-2) is'

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triclinic

cubic

octahedral

tetrahedral

BOD is the oxygen demand with in day(s):

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Four

Two

Three

Five

Which of the following reagents reaet in same manner with HCHO, CH3CHO andCH3COCH3

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HCN

Cu2(OH)2/ NaOH

Ammonical AgNO3

Cu(OH)2 only

Which one of the following statements is wrong for gases?

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gases do not have a definite shape and volume

volume of the gas is equal to volume of container confining the gas

confirmed gas exerts uniform pressure on the walls of its container in which it is enclosed

mass of gas cannot be determined by weighing a container in which it is enclosed

Alcohol can be denaturated by adding:

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Acetone

Methanol

Pyridine

All

Two elements whose electronegativities are 1.2 and 3.0, the formed between them would be

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Ionic

Covalent

Coordinate

Metallic

How much of NaOH is required to neutralize 1500 cm³of 0.1 N HCl?

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60 g

6 g

4 g

40 g

Which of the following alkyl halides is used as a mathylating agent

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CH₂H₅l

CH₃l

C₂H₅Pr

C₂H₅Cl

N-atom forms three covalent bonds, its electronic configuration is

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The main pollutant of leather tanneries in the waste is due to the salt of:

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lead

Chromium (VI)

Copper

Chromium (III)

HNO₂acts as an/a

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Acid

Oxidizing agent

Reducing agent

All the three

Sodium should be stored in

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Air free from moisture

Air free form carbon dioxide

Under water

Under kerosene oil

Drawback DDT as presticide is

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I becomes ineffective after some time

It is less effective than others

It is not easily/rapidly degraded in nature

Its high cost

An ionic compound M₂S₃is formed by the metal M,, the metal is

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Ca

Ba

K

Al

When chlorofluoro carbon are subjected to U.V. they form

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Cations

Anions

Free radicals

None of these

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