Aluminium is used as a reducing agent in the reduction of : (a) \( \mathrm{Cr}_{2} \mathrm{O}_{3...

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Aluminium is used as a reducing agent in the reduction of :
(a) \( \mathrm{Cr}_{2} \mathrm{O}_{3} \)
(c) \( \mathrm{ZnO} \)
(b) \( \mathrm{SnO}_{2} \)
(d) \( \mathrm{HgO} \)
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