JEE Main Chemistry question

Not in JEE Main or NEET syllabus

Hydrogen gas will not reduce:

(A)Heated cupric oxide
(B)Heated ferric oxide
(C)Heated stannic oxide
(D)Heated aluminium oxideCorrect

Answer: (D)

Solution

Hydrogen gas, at elevated temperature, can reduce the oxides of less reactive metals such as copper (CuO → Cu), iron (FeO → Fe) and tin (SnO → Sn), since these metals lie below aluminium in the activity/reactivity order and their oxides

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Question ID VK-137320