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Chemistry

Chemistry
The value of Avogadro Number is

6.023 × 1023
6.023 × 1025
6.023 × 1022
6.023 × 1024

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Chemistry
Which one of the following is not a cause for present global warming and climate change ?

Methane emission
Carbondioxide emission
Deforstation
CFC emission

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Chemistry
Which one of the following group of gases contributes to the 'Green House Effect'?

Ammonia and Ozone
Carbon tetraflouride and Nitrous oxide
Carbon monoxide and Sulphur dioxide
Carbon dioxide and Methane

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Chemistry
The substance which does not expand on going from liquid state to solid state is

Water
Cast-iron
Aluminium
Type metal

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Chemistry
The natural source of hydro-carbon is

Coal
Carbohydrates
Biomass
Crude oil

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Chemistry
In upper layer of atmosphere ozone is formed by

The combination of oxygen molecules
The action of ultraviolet rays on oxygen
The action of nitrogen on oxygen in atmosphere
Subjecting oxygen to high pressure

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