${N a}_{2} S_{2} O_{3}$ is used in photography because of its:

reducing behaviour

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oxidising behaviour

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complex forming behaviour

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reaction with light

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Solution

The correct option is C complex forming behaviour
Sodium thiosulphate forms a complex with silver bromide, which is a light sensitive compound used in making photographic paper. Therefore, sodium thiosulphate is used in photography.
$A g B r + 2 N a_{2} S_{2} O_{3} \to N a_{3} [A g (S_{2} O_{3})_{2}] + N a B r$

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