JEE Main 20139 AprilOnline

Exam: JEE Main
Year: 2013
Date: 9 April
Mode: Online
Subject: Chemistry
Chapter: Classification of Elements and Periodicity in Properties

JEE Main 2013 · 9 April · Online · Chemistry · Classification of Elements and Periodicity in Properties

Electron gain enthalpy with negative sign of fluorine is less than...

Electron gain enthalpy with negative sign of fluorine is less than that of chlorine due to :

Options

AHigh ionization enthalpy of fluorine
BSmaller size of chlorine atom
CSmaller size of fluorine atom
DBigger size of $2 p$ orbital of fluorine

Correct answer

C. Smaller size of fluorine atom

Step-by-step solution

The electron gain enthalpy order for halogens is

\mathrm{Cl}>\mathrm{F}>\mathrm{Br}>\mathrm{I}

Due to small size of fluorine the extra electron to be added feels more electronelectron repulsion. Therefore fluorine has less value for electron affinity than chlorine.

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