Name the type of reaction involved in black and white photography.

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Solution

The reactions used in black and white photography are decomposition reactions.
Photolysis of silver chloride is the reaction involved in black and white photography.
The reaction is as follows
$2 A g C l (W h i t e) l i g h t - -- \to 2 A g (G r e y) + C l_{2}$
$2 A g B r (Y e l l o w) l i g h t - -- \to 2 A g (G r e y) + B r_{2}$
As this reaction is sensitive to light, it is used in black and white photography.

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