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

Oxidation.

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Reduction.

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Its complex forming property.

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Its reduction with light.

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Solution

The correct option is D Its complex forming property.
It reacts with the undecomposed silver bromide( AgBr) to form a silver thiosulphate complex which is soluble in nature.

Because of its complex forming property it removes undeveloped silver halides from photographic emulsions.

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