Sodium thiosulphate `(Na_(2)S_(2)O_(3).5H_(2)O)` is used in photography to
Sodium thiosulphate `(Na_(2)S_(2)O_(3).5H_(2)O)` is used in photography to
A. Dissolving out unreacted silver bromide
B. Converting silver halides to metallic silver
C. Reducing solubility of AgBr
D. Preventing overdeveloping and fogging
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Correct Answer - A
Sodium thiosulphate dissolved the undecomposed or unreacted AgBr. As such it fixes the image.
`AgBr (aq) +2Na_2S_2O_3 (aq) to Na_3[Ag(S_2O_3)_2](aq) + NaBr(aq)`
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