(A) `:` `PbCl_(2)` and `HgCl_(2)` precipitates can be separated by hot water.
`(R ) :` Aqueous solution of `PbCl_(2)` give yellow precipitate with `K_(2)CrO_(4)` solution.

Answer

2

Explanation

`Pb^(+2)` is present if the precipitate disosolves in hot water. `Hg_(2)^(2+)` is present if the precipitate does not dissolve in hot water.