A) Completing agent
B) oxidizing agent
C) Reducing agent
D) none of these
Correct Answer: A
Solution :
In photography sodium thiosulphate (hypo) is used as a complexing agent. It dissolves unreduced silver bromide by forming a complex. \[AgBr+\underset{hypo}{\mathop{2N{{a}_{2}}{{S}_{2}}{{O}_{3}}}}\,\to \underset{\begin{smallmatrix} Sodium\text{ }\arg entothiosulphate \\ \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,(so\operatorname{lub}le) \end{smallmatrix}}{\mathop{N{{a}_{3}}[Ag{{({{S}_{2}}{{O}_{3}})}_{2}}]}}\,+NaBr\]
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