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Which is the main constituent in air ?
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Why is the percentage of oxygen today the same as it was thousands years ago, even though the whole world inhals it?
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What is the difference between hard and soft water ?
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In the calculation of calorific value of any fuel why the latent heat of vap. of water is taken as 587 kj/mol whereas actually it is 540kj/mol?
why helium does not react with other elements?
Organic Chemistry 
