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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 |
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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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