A s-block element (M) reacts with oxygen to form an oxide of the formula MO 2 . The oxide is pale yellow in colour and paramagnetic. The element ( M ) is:

Question

A s-block element (M) reacts with oxygen to form an oxide of the formula MO 2 . The oxide is pale yellow in colour and paramagnetic. The element ( M ) is:, Mg, Na, Ca, K

MARKS App · Accepted Answer

(A) 2 Mg + O 2 → 2 MgO (Diamagnetic) (B) 2 Na + O 2 → Na 2 O (Diamagnetic) 2 Na + O 2 ( excess ) → Na 2 O 2 (Diamagnetic) (C) 2 Ca + O 2 → 2 CaO (Diamagnetic) Ca + O 2 → CaO 2 (Diamagnetic) (D) K + O 2 (excess) → KO 2 (Paramagnetic)

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