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AIIMS 201926 May

Exam: AIIMS
Year: 2019
Date: 26 May
Subject: Chemistry
Chapter: Classification of Elements and Periodicity in Properties

AIIMS 2019 · 26 May · Chemistry · Classification of Elements and Periodicity in Properties

Which pair of elements has maximum electronegativity difference?

Which pair of elements has maximum electronegativity difference?

Options

A $\mathrm{Li}$ and $\mathrm{F}$
B $\mathrm{Na}$ and $\mathrm{F}$
C $\mathrm{Na}$ and $\mathrm{Br}$
D $\mathrm{Na}$ and $\mathrm{Cl}$

Correct answer

B. $\mathrm{Na}$ and $\mathrm{F}$

Step-by-step solution

Among

\mathrm{Li}

and

\mathrm{Na}, \mathrm{Na}

is more electropositive. Among

\mathrm{F}, \mathrm{Cl}

and

\mathrm{Br}, \mathrm{F}

is most electronegative. So,

\mathrm{Na}

and

\mathrm{F}

will have maximum electronegativity difference. E.N. value :

3.983 .16 \quad 2.96 \quad 2.66 \quad 0.98 \quad 0.93

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