Q. 45.0( 1 Vote )

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Answer :

(a) Potassium chlorate – oxygen


Explanation:


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


Explanation:


Micro-organisms bring the nitrogen fixation.


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


(c) Greenhouse effect – Carbon dioxide


Explanation:


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


(d) fertilizers – nitrogen


Explanation:


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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