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First three ionisation energies (in kJ/m...

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

Then incorrect option is:

A

Q : Alkaline earth metal

B

P: Alkali metals

C

R: s-block element

D

They belong to same period

Text Solution

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The correct Answer is:
C
R is p-block element, because difference between `IE_2` and `E_3` is not very high as compared to between `IE_1 " and " E_2` hence stable oxidation state of R will be higher than + 2
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