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Question

${N a}_{2} S_{2} O_{3}$ is used in photography because of ?
Oxidation.
Reduction.
Its reduction with light.
Its complex forming property.

A

Its complex forming property.

B

Reduction.

C

Oxidation.

D

Its reduction with light.

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Solution

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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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