A) complexing agent
B) oxidising agent
C) reducing agent
D) none of the above
Correct Answer: A
Solution :
In photography \[N{{a}_{2}}{{S}_{2}}{{O}_{3}}\] (or hypo or sodium thiosulphate) is used as complexing agent. It dissolves unreduced silver bromide by forming a complex. \[AgBr+\underset{hypo}{\mathop{2N{{a}_{2}}{{S}_{2}}{{O}_{3}}}}\,\xrightarrow{{}}\underset{\underset{\left( soluble\text{ }complex \right)}{\mathop{sodium\text{ }argentothiosulphate}}\,}{\mathop{N{{a}_{3}}[Ag{{({{S}_{2}}{{O}_{3}})}_{2}}]}}\,\]+ NaBr
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