Sodium thiosulphate is used in photography

Sodium thiosulphate is used in photography

A
To convert metallic silver into silver salt
B
$A g B r$ grain is reduced to non-metallic silver
C
To remove reduced silver
D
To remove un decompose $AgBr$ in the form of ${Na}_{3} [Ag {[S_{2} O_{3})}_{2}]$ (a complex salt)

Solution:

Sodium thiosulphate removes the un decompose $AgBr$ in the form of ${Na}_{3} [Ag {(S_{2} O_{3})}_{2}]$ complex

$AgBr + 2 {Na}_{2} S_{2} O_{3} \to {Na}_{3} [Ag {(S_{2} O_{3})}_{2}] + NaBr$

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