Q.

Which of the following compounds are usually black on heating and red on cold?

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a

ZnO  ;  PbO

b

PbNO32 ; NaCl

c

HgO  ;  Pb3O4

d

Ammonium salts

answer is C.

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Detailed Solution

on heating                                        on coolingZnO→ yellow                               ZnO→WhitePbO→Reddish Brown                PbO→YellowHgO, Pb3O4→Black                  HgO, Pb3O4→ RedFe2O3→Black                           Fe2O3→Red Brown
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