Question

A scalet compound A is treated with concenbtrated `HNO_(3)`to gave a chocolate brown precipitate B. The precipitate is filtered and the filtrate is neurralised with NaOH Addition of KI to the resulting solution gives a yellow precipitate C the brown precipitate B on warming with concentrated `HNO_(3) `in the presence of `Mn(NO_(3))_(2)` produces a pink coloured solution due to the formation of D identify A, B,C, and D write the reaction sequence.

Answer 1

A : `Pb_(3)O_(4) B : PbO_(2) C : PbI_(2)O_(4) B : Pb(MnO_(4))_(2)`
The pink coloured compound is precipitate salt which is formed by the oxidation of maganese salt lead dioxide .The yellow precipitate to be red lead .
`underset((A))(Pb_(3)O_(4)+)4HNO_(3)rarrunderset((B))(PbO_(2)darr)+underset("Filtrate")(2Pb(NO_(3))_(2))+2H_(2)O`
`Pb (NO_(3))_(2) +2KI rarr underset("Yellow"(C))(PbI_(2)darr)+2KNO_(3)`
`5PbO_(2) +2Mn(NO_(3))_(2) +4HNO_(3) rarr`
`Pb(MnO_(4))_(2)+underset((D))(4Pb(NO_(3))_(2))+2H_(2)O`