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a
CO2 is neither combustible nor supporter of combustion
b
CO is a combustible gas
c
CO cannot reduce alkali metal oxides
d
CO2 reduces CuO to Cu is
answer is D.
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Detailed Solution
→CO2 is neither combustible nor supporter of combustion→ CO is a combustable gasCO+12O2→CO2gBlue flames+∆→ CO Can't reduce alkali metal oxidesSince, alkali metals have grater tendency towards oxygen than "CO" →CO2 can't reduces the CuO to Cu Where as CO can reduces the CuO to CuCO+CuO→CO2+Cu