option d. is the correct answer.
Which oxide of a metal gets reduced only by coke and not by H2 gas or Co gas?
a. CuO
b. PbO
c. Fe2O3
d.ZnO
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Which oxide of a metal gets reduced only by coke and not by H2 gas or Co gas?
a. CuO
b. PbO
c. Fe2O3
d.ZnO