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Question

For the reactions,
(i) H2(g)+Cl2(g)=2HCl(g)+x kJ
(ii) 2HCl(g)=H2(g)+Cl2(g)−y kJ
which one of the following statements is correct?

A
xy>0
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B
xy<0
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C
xy=0
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D
None of these
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Solution

The correct option is C xy=0
Since 1st reaction is opposite of the 2nd reaction.
So, on adding both reactions we will get,
xy=0
Hence, answer is option C.

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