1.

Sodiumthiosulphate is used in photography to(a) reduce AgBr grains to metallic Ag(b) dissolve out Ag produced by reduction(c) remove unaffected AgBr in the photographic filmor plate(d) none of these

Answer»

The correct option is(c) remove unaffected AgBr in the photographic filmor plate.

Explanation:

In photography, AgBr is mainly used as the light sensitive material. The unchanged AgBr after developing the film is treated with Na2S2O3. Solution of sodium thiosulphate is used as fixer and forms a soluble complex with silver halide.

AgBr + 2Na2S2O3---->Na3[Ag(S2O3)2] + NaBr



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