Q. 45.0( 1 Vote )

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Answer :

(a) Potassium chlorate – oxygen


Potassium chlorate is used in the preparation of oxygen.

It is heated at 300°C in the presence of a catalyst to give oxygen and potassium chloride.

KClO3 2KCl + O2

Potassium Potassium Oxygen

Chlorate Chloride

(b) Micro-organisms – nitrogen fixation


Micro-organisms bring the nitrogen fixation.

Two types of micro-organisms are present which bring nitrogen fixation.

(c) Greenhouse effect – Carbon dioxide


The carbon dioxide is increasing day by day in the atmosphere. This increases the threat from the greenhouse effect.

(d) fertilizers – nitrogen


Plants get nitrogen in the form of fertilizers.

Nitrogen is the only constituent which helps in producing the fertilizers.

This helps them to grow faster.

(e) Manganese dioxide – Catalyst

Explanation: Manganese dioxide is used as a catalyst in the preparation of oxygen.

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