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Q.

Sodium thiosulphate is used in photography to

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a

none of these

b

Sodium thiosulphate is used in photography to

c

remove unaffected AgBr in the photographic film or plate

d

dissolve out Ag produced by reduction

answer is C.

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Detailed Solution

  • Sodium thiosulfate (sodium hyposulfite), Na2S2O3, is used by photographers to fix developed negatives and prints
  •  it acts by dissolving the part of the silver salts coated onto film which remain unchanged by exposure to light.
  • In photography, undecomposed AgBr is removed with the help of sodium thiosulphate, i.e., hypo.
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