Question # 1

Coal is the mixture of

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Hydrogen

Methane

Carbon monoxide

All

Formic acid is present in

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String of bees

Sour milk

Apple

Fats

Which vitamin is soluble in water?

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Vitamin A

Vitamin E

Vitamin D

Vitamin C

Soda lime is a mixture of..

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CaCl, + KOH

NaOH + CaO

NaOH + CaCl₂

Ca(OH)₂ + CaO

Which colour of HI is ?

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Orange

Purple

Red

Colourless

pH of neutral solution is always.

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6

5

7

10

How many percentage blister copper is pure?

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95%

75%

98%

100%

Which gas protects the Earth's surface from ultraviolet radiations?

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CO₂

CO

N₂

O₃

Which of the following statement s is not true about fossil fuels?

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they all contain carbon

They are renewable

they produce pollutants when burnt

they cause acid rain

The major constituents of troposphere are:

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carbon dioxide and argon

nitrogen and oxygen

argon and oxygen

carbon dioxide and oxygen

Swimming pools are cleaned by a process:

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Hydrogenation

Bromination

Chlorination

Nitration

Oxidation of alkenes produce.

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Glyoxal

Glycol

Oxalic acid

Formic acid

General formula of alcohols is:

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RCHO

ROH

O= R - C -OH

O = R - C- R

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