A) To convert metallic silver into silver salt
B) AgBr grain is reduced to non-metallic silver
C) To remove reduced silver
D) To remove undecomposed AgBr in the form of \[N{{a}_{3}}[Ag{{[{{S}_{2}}{{O}_{3}})}_{2}}]\] (a complex salt)
Correct Answer: A
Solution :
Sodium thiosulphate is a reducing agent which convert metalic silver into silver salt.
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