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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?A. IB. IIC. IIID. IV |
| Answer» Ist IE small and 2nd IE very high so Ist is alkali metal. | |