Among the following reactions of hydrogen wit | vedclass

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Question

(A) The reactivity of halogens towards hydrogen decreases down the group as the oxidizing power of halogens decreases. $F_2$ reacts even in the dark,$

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$H_2 + I_2 	o 2HI$

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(A) The reactivity of halogens towards hydrogen decreases down the group as the oxidizing power of halogens decreases. $F_2$ reacts even in the dark,$Cl_2$ reacts in the presence of sunlight,and $Br_2$ requires heat. However,the reaction between $H_2$ and $I_2$ is slow and reversible,requiring a catalyst (like finely divided platinum or nickel) and high temperature to proceed effectively.

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

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