(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
(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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