Elements $X, Y$ and $Z$ have atomic numbers $19, 37$ and $55$ respectively. Which of the following statements is true about them?
- A$Y$ would have an ionisation potential between those of $X$ and $Z$.
- B$Z$ would have the highest ionisation potential.
- C$Y$ would have the highest ionisation potential.
- DTheir ionisation potential would increase with increasing atomic number.
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The correct option for the first ionisation enthalpy (in $kJ \ mol^{-1}$) of $Li$,$Na$,$K$ and $Cs$ respectively is
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