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JIPMER 2006

Exam: JIPMER
Year: 2006
Subject: Chemistry
Chapter: s Block Elements

JIPMER 2006 · Chemistry · s Block Elements

What will be the order of Ist ionisation energy ?

What will be the order of Ist ionisation energy ?

Options

A $\mathrm{Li}\gt\mathrm{Na}\gt\mathrm{K}$
B $\mathrm{K}\gt\mathrm{Li}\gt\mathrm{Na}$
C $\mathrm{Na}\gt\mathrm{Li}\gt\mathrm{K}$
D $\mathrm{Li}\gt\mathrm{K}\gt\mathrm{Na}$

Correct answer

A. $\mathrm{Li}\gt\mathrm{Na}\gt\mathrm{K}$

Step-by-step solution

In a sub-group ionisation energy decreases from top to bottom because atomic size increases. So, the Ist IE of

\mathrm{Li}, \mathrm{Na}

and K are in the order

\mathrm{Li}\gt\mathrm{Na}\gt\mathrm{K}

.

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