JEE Main Chemistry question

Not in JEE Main or NEET syllabus

In between the metals A and B, both form oxide but B also forms nitride, when both burn in air. So A and B are:

(A)Cs,K
(B)Mg,Ca
(C)Li,Na
(D)K,MgCorrect

Answer: (D)

Solution

Potassium burns in air to form the superoxide (an oxide), but does not form a nitride with atmospheric ; magnesium burns in air to form both the oxide MgO and the nitride . This matches

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Question ID VK-137964