Observe the following data ($ \Delta_i H_1, \Delta_i H_2 $ and $ \Delta_{eg} H $ represent the first,second ionisation enthalpies and electron gain enthalpy respectively).
Element$ \Delta_i H_1 $ $( kJ \ mol^{-1} )$$ \Delta_i H_2 $ $( kJ \ mol^{-1} )$$ \Delta_{eg} H $ $( kJ \ mol^{-1} )$
$ I $$ 520 $$ 7300 $$ -60 $
$ I.I $$ 490 $$ 3051 $$ -48 $
$ III $$ 1681 $$ 3374 $$ -328 $
$ IV $$ 2372 $$ 5251 $$ +48 $

Using the data,identify the most reactive metal.

  • A
    $ II $
  • B
    $ I $
  • C
    $ IV $
  • D
    $ III $

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