JEE Main 201226 MayOnline

Exam: JEE Main
Year: 2012
Date: 26 May
Mode: Online
Subject: Chemistry
Chapter: Classification of Elements and Periodicity in Properties

JEE Main 2012 · 26 May · Online · Chemistry · Classification of Elements and Periodicity in Properties

Which of the following presents the correct order of second...

Which of the following presents the correct order of second ionization enthalpies of

\mathrm{C}, \mathrm{N}, \mathrm{O}

and

\mathrm{F}

Options

AF $>\mathrm{O}>\mathrm{N}>\mathrm{C}$
BO $>$ N $>$ F $>$ C
C $\mathrm{C}>\mathrm{N}>\mathrm{O}>\mathrm{F}$
DO $>$ F $>$ N $>$ C

Correct answer

D. O $>$ F $>$ N $>$ C

Step-by-step solution

In a period the value of ionisation potential increases from left to right with breaks where the atoms have some what stable configuration. After removing an

e^{-}

oxygen will acquire stable configuration. Hence

\mathrm{O}^{+}

has highest second ionisation enthalpy than

\mathrm{F}^{+}

and

\mathrm{N}^{+}

\therefore

correct order is

\mathrm{O}>\mathrm{F}>\mathrm{N}>\mathrm{C}

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