Question # 1

Which is unnecessary for purification of water for drink purposes:

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coagulation

aeration

treatment with lodine

treatment with chlorine

Which pair of elements will have the same type of bonds between their atoms in the solid state?

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carbon and calcium

lithium and boron

aluminium and phosphorus

nitrogen and carbon

Newspaper can be recycled again and again by how many times

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5

4

2

3

All of the following are simple proteins except

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Histones

Albumin

Keratins

Glycoprotein

Transformation is a cyclic process in which used plactic is

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Remelted and styrene is added

Converted into low quality substance

Converted back into original components

None of these

The highest melting point is observed by

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Butanoic acid

Propanoic acid

Pentanoie acid

HCI

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 reactions to take place

air must be blowing swifty

there must be SO₂in the air

A real gas obeying Vander Waal's equation will resemble ideal gas if

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Both a and b are large

Both a and b are small

a is small and b is large

a is large and b is small

The mono atomic gases are

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Halogens

Noble gases

6h group elements

Nitrogen and oxygen

Coal contains sulphur in it:

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1-3%

1-6%

1-9%

1-12%

In Case of elements the polymorphism is called

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Isotopic form

Allotropy

Isomorphism

Crystalline forms

A cell in which electric current is produced as a result spontaneous redox reaction is called :

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Dry cell

Electrolytic cell

Galvanic cell

Standard cell

Alkyl halides react with Mg in dry ether to form

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Magnesium halide

Grignard's reagent

Alkene

Alkyne

Boiling point of acetic acid is°C:

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116

117

118

119

Precipitation will occur until the ionic product becomes

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Equal to K_sp

Lesser than K_sp

Greater than K_sp

None of these

1, 3-Dibromopropane reacts with metallic zinc to form

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Propene

Propane

Cyclopropane

Hexane

The product of the reaction between propanone and HCN is hydrolysed under acidic conditions. What is the formula of the final product

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CH₃CH(OH)COOH

CH₃CH₂CH(OH)COOH

(CH₃)₂C(OH)COOH

CH₃CH₂CH₂COOH

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High temperature and low pressure

Low temperature and low pressure

Low temperature and high pressure

High temperature and high pressure

Environmental pollution affects

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Biotic components

Plants only

Man only

Biotic and abiotic components of environment

When aluminium electrode is coupled with copper electrode in a galvanic cell :

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Reduction takes place at aluminium electrode.

Oxidation takes place at copper electrode.

Reduction takes place at copper electrode.

Both (a) and (c)

The reaction between fat and NaOH is called:

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Esterification

Hydrogenolysis

Fermentation

Sponification

Most metals are conductors of electricity because of the :

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Light weight.

Immobility of the electrons.

Lustrous surfaces

Relatively free movement of their electrons

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