Question

Assertion :Silver halides, e.g., AgBr, typical components of photographic emulsions, dissolve upon treatment with aqueous thiosulfate:. Reason: Thiosulphates are used as oxidizing agents.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Both Assertion and Reason are incorrect

Answer 1

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

$AgBr+2S_2{O}_3^{2-}⟶\left[Ag\right(S_2{O}_3{)}_2{]}^{3-}+B{r}^{-}$

Here $B{r}^{-}$ is not getting oxidising.

Here,the reaction just form co-ordinate complex.

So,even through thiosulphate is oxidising agent its properly is not used here.