Which oxide cannot be reduced by \( \mathrm{H}_{2} \) ? (A) \( \mathrm{Al}_{2} \mathrm{O}_{3} \)...
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Which oxide cannot be reduced by \( \mathrm{H}_{2} \) ?
(A) \( \mathrm{Al}_{2} \mathrm{O}_{3} \)
(B) \( \mathrm{CuO} \)
(C) \( \mathrm{ZnO} \)
(D) All of these
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