Q. Aqueous solution of $A$ can dissolve $AgBr$ forming a soluble complex $B, A$ also reacts with aqueous $AgNO _3$ solution giving white ppt. $C$ changing to black ppt $D, A, B, C$ and $D$ are
Some Basic Concepts of Chemistry
Solution:
Correct answer is (a) (A) - $Na _2 S _2 O _3 $ (B) - $Na _3\left[ Ag \left( S _2 O _3\right)_2\right] $, (C) - $Ag _2 S _2 O _3$ (D) - $ Ag _2 S$