First three ionisation energies (in kJ/mol) of three representative elements are given below Element IE_1 IE_2 IE_3 P 495.8 4562 6910 Q 737.7 1451 7733 R 577.5 1817 2745 Then incorrect option is

First three ionisation energies (in kJ/mol) of three representati…

MCQ

First three ionisation energies (in $kJ/mol$) of three representative elements are given below

Element	$IE_1$	$IE_2$	$IE_3$
$P$	$495.8$	$4562$	$6910$
$Q$	$737.7$	$1451$	$7733$
$R$	$577.5$	$1817$	$2745$

Then incorrect option is

A
$Q:$ Alkaline earth metal
B
$P:$ Alkali metals
✓
$R: s-block$ element
D
They belong to same period

✓

Answer

Correct option: C.

$R: s-block$ element

c
$(c) \,R$ is $p-block$ element, because difference between $IE_2$ and $IE_3$ is not very high as compared to between $IE_1$ and $IE_2$; hence stable oxidation state of $R$ will be higher than $+2.$

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