Question # 1

Alkanes give reaction only

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Addition

Decomposition

Substitution

Displacement

Carbon monoxide is harmful to use because it:

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Paralyses lungs

Damages lungs

Reduce oxygen carrying ability of hemoglobin

Make the blood coagulate

The freezing point of water is:

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10 ^oC

100^oC

0^oC

46^oC

The gas use by plants to perform photosynthesis.

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O₂

CO₂

N₂

CO

A dynamic equilibrium

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Reaction stops to proceed

Amounts of reactants and products are equal

Rate of forward and reverse reaction are equl

Reaction can no longer be reversed.

The residual oil is heated above 400 c to produce.

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Lubricants

Paraffin wax

Asphalt

All

At which temperature o water shows mxamimum density.

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0 ^oC

100^oC

4^oC

-4^oC

The accumulation of which vitamin causes bone like deposits in the kidney.

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Vitamin D

Vitamin E

Vitamin B

Vitamin A

Building block of lipids are.

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Fatty acids

Carboxylic acids

Mineral acids

Alcohols

Process of heating the concentrated ore to high temperature in excess of air is called.

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Roasting

Smelting

Bessemerization

All

How many % age of nitrogen present in air by volume?

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70%

75%

78%

80%

Which gas is used to destroy harmful bacteria in water?

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Iodine

Chlorine

Flourine

Bromine

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

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CO₂

CO

N₂

O₃

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