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Chemistry

Chemistry
Ultraviolet radiation striking the earth is due to the depletion of

Oxygen
Carbon dioxide
Ozone
Carbon monoxide

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Chemistry
The inherited traits of an organism are controlled by

RNA molecules
enzymes
DNA molecules
nucleotides

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Chemistry
Which of the following pollutants is main product of automobile exhaust ?

NO
CO
Hydrocarbons
CO2

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Chemistry
Catalyst is a substance which

Has no action on the rate of the reaction
Decreases the rate of reaction
None of these
Increases the rate of the reaction

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Chemistry
The percentage of carbon in cost iron is :

0.01 to 0.25
0.5 to 1.5
6 to 8
3 to 5

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Chemistry
Burning pyrites ore gives out

Nitric oxide gas
Sulphur dioxide gas
Nitrogen dioxide gas
Carbon dioxide gas

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