Q.

Two metals A & B having similar ionic radii, react with oxygen to give only monoxides, and react with nitrogen to give nitrides.  Then, A & B respectively are

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a

 Li and Na

b

Na and Be 

c

Na and Ca

d

Li and Mg

answer is C.

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Detailed Solution

Li and Mg show diagonal relationship due to same polarizing power and also form monoxide, give nitrides.
 

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