A scarlet compound A is treated with conc. ${HNO}_{3}$ to give a chocolate brown precipitate B. The precipitate is filtered and the filtrate is neutralized with NaOH. Addition of KI to the resulting solution gives a yellow precipitate C. The precipitate B on warming with conc. ${HNO}_{3}$ in the presence of $Mn {({NO}_{3})}_{2}$ produce a pink-coloured solution due to the formation of D. Correct statement(s) regarding A to D is/are

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A is ${Fe}_{3} O_{4} .$

B has a metal ion in +4 oxidation state.

C is ${PbI}_{2}$

D is ${Mn}_{2} O_{7}$

answer is B, C.

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Detailed Solution

$A : {Pb}_{3} O_{4}; \underset{}{B : {PbO}_{2}}; C : {Pbl}_{2}; D : Pb {({MnO}_{4})}_{2}$

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