1. Tardigrade
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  3. Chemistry
  4. The correct option for the first ionisation enthalpy (in kJ mol -1 ) of Li, Na , K and Cs respectively is

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Q. The correct option for the first ionisation enthalpy (in $kJ\, mol ^{-1} )$ of $Li$, $Na , K$ and $Cs$ respectively is

TS EAMCET 2018

Solution:

First ionisation enthalpy increase with smaller size. Li is smallest. So, Li has highest first ionisation enthalpy.

$Li >\, Na >\, K >\, Cs$