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Question

A red coloured mixed oxide (X) on treatment with conc. HNO3 gives a compound (Y). (Y) with HCl produces a chloride compound (Z) which can also be produced by treating (X) with cone. HCl. Compounds (X), (Y) and (Z) will be :

A
Mn3O4, MnO2, MnCl2
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B
Pb3O4, PbO2, PbCl2
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C
Fe3O4, Fe2O3, FeCl2
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D
Fe3O4, Fe2O3, FeCl3
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Solution

The correct options are
A Pb3O4, PbO2, PbCl2
C Fe3O4, Fe2O3, FeCl3
Pb3O4+4HNO32Pb(NO3)2+PbO2+2H2O
PbO2+HClPbCl2+H2O+Cl2
Pb3O4+8HCl4H2O+3PbCl2+Cl2
X, Y and Z are Pb3O4,PbO2,PbCl2 respectively.

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