Assertion : $H_{2}$ and $C l_{2}$ can also react in dark to give $H C l$ . Reason: Formation of $H C l$ in presence of sunlight is an explosive reaction.

If both assertion and reason are CORRECT and the reason is the CORRECT explanation of the assertion.

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If both assertion and reason are CORRECT, but reason is NOT THE CORRECT explanation of the assertion.

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If assertion is CORRECT, but reason is INCORRECT.

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If assertion is INCORRECT, but reason is CORRECT.

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Solution

The correct option is D If assertion is INCORRECT, but reason is CORRECT.
Hydrogen and chlorine both are photo sensitive and shows free redical reaction. A radical is an atomic or molecular species having an unpaired, or odd, electron.
The reaction is initiated by the input of energy (heat or light). The weak chlorine-chlorine bond is broken homolytically to give chlorine atoms.
Cl-Cl +Energy or light = 2Cl*
Cl* + $H_{2}$ = Cl* + HCl
H* + Cl* = HCl
Thus assertion is wrong but reason is correct. Option D is correct.

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Choose the correct option.

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Assertion :H2 and Cl2 can also react in dark to give HCl. Reason: Formation of HCl in presence of sunlight is an explosive reaction.

Assertion : $H_{2}$ and $C l_{2}$ can also react in dark to give $H C l$ . Reason: Formation of $H C l$ in presence of sunlight is an explosive reaction.