Sodium thiosulphate is added in photography to

Sodium thiosulphate is added in photography to

Options

(a) improve colour of photograph
(b) remove unreacted AgBr
(c) form latent image
(d) to form a better picture

Correct Answer:

remove unreacted AgBr

Explanation:

AgBr + 2 Na₂S₂O₃ → Na₃ [Ag (S₂O₃)₂] + NaBr
Solution of sodium thiosulphate is used as fixer. It forms a soluble complex with silver halides. After fixing, the film can safely be brought out into daylight.

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