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Question

Hydrogen and chlorine combine together to form hydrochloric acid when exposed to sunlight. This type of reactions are called :

A
photochemical reactions
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B
electrochemical reactions
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C
physical changes
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D
periodic changes
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Solution

The correct option is A photochemical reactions
Exposure to sunlight initiates the reaction between chlorine and Hydrogen giving rise to hydrochloric acid. Thus, it is called photochemical reaction.
overall reaction: H2+Cl2hv2HCl
Initiation: Cl2+hv2Cl
Propagation: Cl+H2HCl+H
H+Cl2HCl+Cl
Termination: 2HH2
2ClCl2
H+ClHCl
The enthalpy for the overall reaction is -184.6KJ/ 2mols of HCl. This reaction is catalyzed by the light(photochemical reaction) towards the violet end of the visible spectrum.

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