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JEE Main 201910 JanuaryEvening Shift

Exam: JEE Main
Year: 2019
Date: 10 January
Shift: Evening Shift
Subject: Chemistry
Chapter: p Block Elements (Group 15, 16, 17 & 18)

JEE Main 2019 · 10 January · Evening Shift · Chemistry · p Block Elements (Group 15, 16, 17 & 18)

Among the following reactions of hydrogen with halogens, the one...

Among the following reactions of hydrogen with halogens, the one that requires a catalyst is:

Options

A ${H}_{2} + {Cl}_{2} \to 2HCl$
B ${H}_{2} + {I}_{2} \to 2HI$
C ${H}_{2} + {F}_{2} \to 2HF$
D ${H}_{2} + {Br}_{2} \to 2HBr$

Correct answer

B. ${H}_{2} + {I}_{2} \to 2HI$

Step-by-step solution

${I}_{2}$ is the least reactive halogen. So, its reaction with ${H}_{2}$ requires a catalyst.

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