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Q.

Enthalpy change for the reaction

4Hg→ 2H2g,

is -869.6 kJ. The dissociation energy of H—H bond is 

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a

-424.8 kJ

b

+434.8 kJ

c

-869.6 kJ

d

+217.4 kJ

answer is D.

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Detailed Solution

2H−H→ 4H;                     ΔΗ=+869.6 kJ

H−H→ 2H;                       ΔΗ=+434.8 kJ

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