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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