Q.

I1 of an element X is 899 kJ mole–1 and that of another element Y is 801 kJ mole–1. Then X and Y may be

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a

Be, B

b

C, N

c

Li, Be

d

B, C

answer is B.

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Detailed Solution

Since, 899  kJ mole-1(X) comesbefore 801 kJ mole (  -1Y).

The first element will have higher ionization energy over second element. 

Only Optioin B satisfies this condition. Therefore, Option B is the correct answer.

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