Q.

The decreasing order of the first ionization energy in kJmol–1 of He, Mg and Na is He > Mg > Na. The increasing order of second ionization energy of these elements will be

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a

Na < Mg < He

b

Mg < Na < He

c

Mg < He < Na

d

Na < He < Mg

answer is C.

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Detailed Solution

IP1 of  He>Mg>NaIP2 of  Na>He>Mg               (or)              Mg
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