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

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ZnO ; PbO

PbNO32 ; NaCl

HgO ; Pb3O4

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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