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  4. Sodium thiosulphate (Na2S2O3. 5H2O) is used in photography to

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Q. Sodium thiosulphate $(Na_{2}S_{2}O_{3}. 5H_{2}O)$ is used in photography to

The s-Block Elements

Solution:

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