Question

Which among the following statement(s) is (are) true? Exposure of silver chloride to sunlight for a long duration turns grey due to (i) the formation of silver by decomposition of silver chloride (ii) sublimation of silver chloride (iii) decomposition of chlorine gas from silver chloride (iv) oxidation of silver chloride

• A. (i) only
• B. (i) and (iii)
• C. (ii) and (iii)
• D. (iv) only

Answer 1

The correct option is B

(i) and (iii)

Explanation for correct option:

B. (i) and (iii)

Reaction of Silver chloride in exposure to sunlight:

• When Silver chloride is exposed to sunlight for a long time, it turns into greyish color due to the formation of silver metal and release of chlorine gas by decomposition of Silver chloride.
• The decomposition reaction of Silver chloride can be depicted as:
• $2\mathrm{AgCl}\left(\mathrm{s}\right)\stackrel{\mathrm{sunlight}}{\to }2\mathrm{Ag}\left(\mathrm{s}\right)+{\mathrm{Cl}}_2\left(\mathrm{g}\right)$

Uses of silver chloride:

• It is used in white and black photography.

Explanation for incorrect options:

The wrong statements are given below:

(ii) sublimation of silver chloride- The reaction of silver chloride forming silver metal is a decomposition reaction. Thus this statement is wrong.

(iv) oxidation of silver chloride- There is no oxidation of silver chloride that takes place. Thus, this statement is wrong.

Hence, options A, C, and D are incorrect.

Therefore, the correct option is B i.e. (i) and (iii).