A) remove reduced silver
B) remove undecomposed AgBr as soluble silver thiosulphate complex
C) convert the metallic silver to silver salt
D) reduce the silver bromide grains to metallic silver
Correct Answer: B
Solution :
\[2N{{a}_{2}}{{S}_{2}}{{O}_{3}}+\underset{\text{Unexposed}}{\mathop{AgBr}}\,\xrightarrow{{}}N{{a}_{3}}\,[Ag\,{{({{S}_{2}}{{O}_{3}})}_{2}}]+NaBr\] This property is used for fixing in photography.
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