The first `(Delta_(i)H_(1)` and second `(Delta_(i)H_(2)` ionization enthalpies (in kJ/mol) and electron gain enthalpy (in kJ/mol) of few elements are given below:
`{:("Elements",Delta_(i)H_(1),Delta_(i)H_(2),Delta_(eg)H),(I,520,7300,-60),(II,1681,3374,-328),(III,899,1757,+48),(IV,2372,5251,+48):}`
Which of the following is likely to be an alkali metal?

Options

A. I and V
B. V and II
C. II and V
D. IV and V

Answer

C

Explanation

I represents Li
II represents K
III represents Br
IV represents I
V represents He
So, amongst these, II represents most reactive metal and V represents least reactive non-metal.