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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) \( \mathrm{Cs}, \mathrm{K} \)
(B) \( \mathrm{Mg}, \mathrm{Ca} \)
(C) \( \mathrm{Li}, \mathrm{Na} \)
(D) \( \mathrm{K}, \mathrm{Mg} \)
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