A) \[A{{g}_{2}}S\]
B) \[{{[Ag{{({{S}_{2}}{{O}_{3}})}_{2}}]}^{3-}}\]
C) \[{{[Ag{{(S)}_{2}}]}^{3-}}\]
D) \[{{[Ag{{(S{{O}_{3}})}_{2}}]}^{3-}}\]
Correct Answer: B
Solution :
Silver halides are dissolved by sodium thiosulphate solution (hence, used in photography for fixing) \[\underset{\begin{smallmatrix} Silver \\ bromide \end{smallmatrix}}{\mathop{AgBr}}\,\,\,+\underset{\begin{smallmatrix} Sodium \\ thiosulphate \end{smallmatrix}}{\mathop{\,2N{{a}_{2}}{{S}_{2}}{{O}_{3}}}}\,\xrightarrow{{}}\underset{\begin{align} & Sodium\text{ }argento \\ & thiosulphate \\ & or \\ & {{[Ag{{(S{{O}_{3}})}_{2}}]}^{3-}} \\ \end{align}}{\mathop{N{{a}_{3}}[Ag{{({{S}_{2}}{{O}_{3}})}_{2}}]}}\,+NaBr\]
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