A) reduce \[\text{AgBr}\] grains to metallic silver
B) convert the metallic silver to silver salt
C) remove undecomposed silver bromide as a soluble complex
D) remove reduced silver
Correct Answer: C
Solution :
Hypo or sodium thiosulphate \[(N{{a}_{2}}{{S}_{2}}{{O}_{3}}.5{{H}_{2}}O)\] is used in photography to remove undecomposed silver bromide, which is soluble in hypo and forms a complex salt. \[\underset{\begin{smallmatrix} silver \\ bromide \end{smallmatrix}}{\mathop{AgBr}}\,\,+\underset{hypo}{\mathop{2N{{a}_{2}}{{S}_{2}}{{O}_{3}}}}\,\xrightarrow{{}}\underset{\begin{smallmatrix} \text{sodium}\,\,\text{argento} \\ \text{thiosulphate} \end{smallmatrix}}{\mathop{N{{a}_{3}}[Ag{{({{S}_{2}}{{O}_{3}})}_{2}}]}}\,\] \[+NaBr\]
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