Q36 / 200 · Manipal (MET) 2010 · Chemistry

The ionisation potential order for which set is correct?

A
$\mathrm{Cs} \lt \mathrm{Li} \lt \mathrm{K}$
B
$\mathrm{Cs}\gt\mathrm{Li}\gt\mathrm{B}$
Correct answer
C
$\mathrm{Li}\gt\mathrm{K}\gt\mathrm{Cs}$
D
$\mathrm{B}\gt\mathrm{Li} \lt \mathrm{K}$

Solution

The ionisation potential decreases down the group (due to increase in size of atom) and increases in a period from left to right. $\therefore$ Out of the given choices $\mathrm{Li}\gt\mathrm{K}\gt\mathrm{Cs}$ is correct.

Hence, the correct answer is option: 'C'.

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