Chemistry
Select the correct answer from the choice in bracket to complete each sentence.
Nitrogen of the air is utilized by plants for formation of …………… [carbohydrates/proteins]
The gas evolved as a product of combustion as well as respiration is ……………[nitrogen dioxide / carbon dioxide].
A candle burns in a jar of oxygen, but gets extinguished in …………… [chlorine/nitrogen]
Air has variable composition and hence there is …………… [less/more] oxygen at lower altitudes than at higher altitudes.
Rusting is a chemical reaction which involves …………… [rapid/slow] oxidation.
Air
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Answer
Nitrogen of the air is utilized by plants for formation of proteins.
The gas evolved as a product of combustion as well as respiration is carbon dioxide
A candle burns in a jar of oxygen, but gets extinguished in nitrogen.
Air has variable composition and hence there is more oxygen at lower altitudes than at higher altitudes.
Rusting is a chemical reaction which involves slow oxidation.
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