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JIPMER 2016

Exam: JIPMER
Year: 2016
Subject: Chemistry
Chapter: p Block Elements (Group 15, 16, 17 & 18)

JIPMER 2016 · Chemistry · p Block Elements (Group 15, 16, 17 & 18)

Consider the reaction, H_2+X_2 2 H X , where X is halogen. The...

Consider the reaction,

\mathrm{H}_2+X_2 \longrightarrow 2 \mathrm{H} X

, where

X

is halogen. The reactivity of halogens decrease in the order of

Options

A $\mathrm{Cl}_2\gt\mathrm{F}_2\gt\mathrm{Br}_2\gt$ \mathrm{I} $_2$
B $\mathrm{I}_2\gt\mathrm{Br}_2\gt\mathrm{F}_2\gt\mathrm{Cl}_2$
C $\mathrm{F}_2\gt\mathrm{Cl}_2\gt\mathrm{Br}_2\gt$ \mathrm{I} $_2$
D $\mathrm{I}_2\gt\mathrm{Br}_2\gt\mathrm{Cl}_2\gt\mathrm{F}_2$

Correct answer

C. $\mathrm{F}_2\gt\mathrm{Cl}_2\gt\mathrm{Br}_2\gt$ \mathrm{I} $_2$

Step-by-step solution

\mathrm{H}-\mathrm{H}+\mathrm{X}-\mathrm{X} \longrightarrow 2 \mathrm{HX}

, where

X=

halogen. The correct decreasing order of reactivity of halogen molecule towards

\mathrm{H}_2

is

\mathrm{F}_2\gt\mathrm{Cl}_2\gt\mathrm{Br}_2\gt

\mathrm{I}

_2

.

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