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Q.

Which of the following reactions requires high temperature and catalyst?

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a

H2 + F2 → 2HF

b

H2 + Cl2 → 2HCl

c

H2 + Br2 → 2HBr

d

H2 + I2 → 2HI

answer is D.

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Detailed Solution

Reactivity order of halogens with hydrogens:F2 > Cl2 > Br2 > I2F2 reacts with H2 even in dark, but I2 reacts with H2 in the presence of "Pt" catalyst and at 713KH2 + X2 → 2HX
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