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Question

Moist hydrogen gas combines with chlorine in the presence of diffused sunlight to form HCl. The catalyst used here is :

A
oxygen.
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B
silica.
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C
alum.
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D
moisture.
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Solution

The correct option is C moisture.
Moisture acts as a catalyst in the formation of HCl gas.

It acclerates the reaction.

It provides a reacting medium to hydrogen and chlorine gas.

It increases the interaction between them.


Hence, the correct option is D.



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