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JEE Main levelSingle correct optionDifficulty 2 of 3ph017

Which statement about the reaction of halogens with hydrogen is correct?

A $F X_{2}$ reacts with $H X_{2}$ explosively even in the dark
B $Br X_{2}$ reacts explosively with $H X_{2}$ at room temperature
C $Cl X_{2}$ reacts with $H X_{2}$ explosively in the dark at low temperature
D $I X_{2}$ combines completely with $H X_{2}$ at room temperature to give $HI$

Answer: A

Reactivity with hydrogen falls from F to I.

F X_{2}

explodes with

H X_{2}

even in the dark,

Cl X_{2}

needs light or heat,

Br X_{2}

needs heating with a catalyst, and the

I X_{2}

reaction is slow and reversible.

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