Among the following reactions of hydrogen with halogens,

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Question:

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

  1. $\mathrm{H}_{2}+\mathrm{I}_{2} \rightarrow 2 \mathrm{HI}$

  2. $\mathrm{H}_{2}+\mathrm{F}_{2} \rightarrow 2 \mathrm{HF}$

  3. $\mathrm{H}_{2}+\mathrm{Cl}_{2} \rightarrow 2 \mathrm{HCI}$

  4. $\mathrm{H}_{2}+\mathrm{Br}_{2} \rightarrow 2 \mathrm{HBr}$

Correct Option: 1

Solution:

$\mathrm{H}_{2}+\mathrm{I}_{2} \rightarrow 2 \mathrm{HI}$

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