When an aqueous solution of silver nitrate () is added to an extract containing a thiosulphate (), a white precipitate forms initially. Upon standing or gentle heating, this precipitate rapidly underg

Question

When an aqueous solution of silver nitrate ($AgNO_3$) is added to an extract containing a thiosulphate ($S_2O_3^{2-}$), a white precipitate forms initially. Upon standing or gentle heating, this precipitate rapidly undergoes a color change to black. The black substance formed is:

Prashant Kotian · Accepted Answer

Correct answer: A. The initial white precipitate is silver thiosulphate (). This compound is highly unstable in water and rapidly hydrolyzes/decomposes, especially upon heating, to yield a black precipitate of silver sulphide () and sulphuric acid.

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