Question

An aqueous solution of a mixture of two inorganic salts, when treated with dilute HCl, gave a precipitate (P) and a filtrate (Q). The precipitate P was found to dissolve in hot water. The filtrate (Q) remained unchanged, when treated with `H_(2)S` in a dilute mineral acid medium. however, it gave a precipitate (R) with `H_(2)S` in an ammonical medium. the precipitate R gave a coloured solution (S), when treated with `H_(2)O_(2)` in an aqueous NaOH medium.
Q. The precipitate P contains
A. `Pb^(2+)`
B. `Hg_(2)^(2+)`
C. `Ag^(+)`
D. `Hg^(2+)`

Answer 1

Correct Answer - A
`Pb^(2+)+2Cl^(-) to PbCl_2`(white ppt)