First slide

Alkali metals

Question

Hypo is used in photography because of its

Moderate

A

Complexing ability
B

Solubility in water
C

Reducing behaviour
D

Sensitivity to light

Solution

$AgBr + 2 {Na}_{2} S_{2} O_{3} ⟶ {Na}_{3} [Ag {(S_{2} O_{3})}_{2}] + NaBr$
This reaction is used in photography to remove undecomposed silver halide on photographic plate.

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