We store silver chloride in a dark coloured bottle because it is

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White solid

Undergoes redox reaction

To avoid action by sunlight

None of the above

answer is C.

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Detailed Solution

Concept- Compounds such as silver chloride are sensitive to light and can react to light very quickly, easily undergoing a photolytic decomposition reaction and losing their properties.
Here,

AgCl

is converted into molecular

Ag

atoms by the action of photons of light.
Dark colored bottles interrupt the path of light so that light cannot reach the silver chloride in the bottles and its decomposition is prevented. Silver chloride is known to decompose into silver and chlorine in the presence of light. This silver form is microscopic and blackish grey in colour. Therefore, we lose the use of silver chloride. Therefore, they should be stored in dark bottles to prevent light penetration.
This is shown in the reaction below:

2 AgCl (s) \to 2 Ag (s) + {Cl}_{2} (g)

Hence, the correct option is (3).

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