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B
-196 kcal
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C
-98 kcal
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D
54 kcal
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Solution
The correct option is C -196 kcal (i) H2+Cl2→2HCl;ΔH=−44kcal (ii) 2Na(s)+2HCl(g)→2NaCl(s)+H2(g);ΔH=−152kcal For the reaction 2Na+Cl2→2NaCl, add eq (i) and (ii) , we get ΔH=−44+(−152)=−196kcal Hence option (B) is correct.