Chemistry
Choose the conversion reaction which is exothermic & takes place by supply of catalytic energy.
- Hydrogen to HCl
- Ammonia to nitric acid
- Nitrogen to nitric oxide
- Oxygen to ozone.
Chemical Reaction
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Answer
Ammonia to nitric acid
Reason — The conversion of ammonia to nitric acid involves the catalytic oxidation of ammonia. In this reaction, ammonia reacts with oxygen in the presence of a platinum catalyst and the reaction is exothermic, as heat is evolved.
4NH3 + 5O2 4NO + 6H2O + heat
Hydrogen to HCl :
H2 + Cl2 2HCl
In this reaction, light is required for initiation of the reaction.
Nitrogen to nitric oxide :
N2 + O2 2NO -
This is endothermic reaction and needs very high temperature.
Oxygen to ozone :
3O2 2O3
This is endothermic and requires electrical discharge.
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