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Q.

A→B, ΔH=−10 kJ mol−1 Ea=50 kJ mol−1 then Ea of B→A will be

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a

40  kJ mol−1

b

50 kJ mol−1

c

-50 kJ mol−1

d

60 kJ mol−1

answer is D.

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Detailed Solution

A→B; ΔHf=−10 kJ mol−1(Exothermic)∴ B→A; ΔHb=10 kJ mol−1(endothermic)∴ (Ea)b=ΔHb+(Ea)f                =10+50                =60 kJ mol−1
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