The correct option for the first ionisation enthalpy (in $kJ \ mol^{-1}$) of $Li$,$Na$,$K$ and $Cs$ respectively is
- A$496, 520, 419, 374$
- B$374, 419, 496, 520$
- C$520, 496, 419, 374$
- D$374, 419, 520, 496$
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