Q.

A scarlet compound A is treated with conc. HNO3 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.HNO3 in the presence of Mn(NO3)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

A is Fe3O4.

b

B has a metal ion in +4 oxidation state.

c

C is PbI2

d

D is Mn2O7

answer is B, C.

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Detailed Solution

A:Pb3O4;B:PbO2 ;C:Pbl2;D:PbMnO42

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