As a fixing reagent in photography, ${N a}_{2} S_{2} O_{3}$ is used for :

dissolving out unreacted silver halide

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converting silver bromide into metallic silver

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reducing the solubility of

A g B r

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preventing over developing and fogging

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Solution

The correct option is B dissolving out unreacted silver halide
$4 S_{2} O_{3}^{2 -} + 2 X^{-} \to X_{2} + S_{4} O_{6}^{2 -}$
Thus, $N a_{2} S_{2} O_{3}$ dissolves unreacted silver halide.

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Similar questions

N a_{2} S_{2} O_{3}

A g B r

Silver chloride and silver bromide are used in black and white photography.Which of the following are correct?

(i) Energy in form of light is required for the reaction to happen.

(ii) Both are endothermic reactions.

(iii) Only silver chloride decomposes into solid metal and non- metal gas.

(iv) Both compounds decompose into their respective metal and non- metal gases.

(A g S C N)

(A g B r)

K_{s p}

10^{- 12}

K_{s p}

= 5 \times 10^{- 13}

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