A) \[{{H}_{2}}(g)+{{I}_{2}}(g)\rightleftarrows 2HI(g)\]
B) \[HCl+NaOH\to NaCl+{{H}_{2}}O\]
C) \[C(s)+{{O}_{2}}(g)\rightleftarrows C{{O}_{2}}(g)\]
D) \[{{N}_{2}}(g)+3{{H}_{2}}(g)\to 2N{{H}_{3}}(g)\]
Correct Answer: D
Solution :
[d] \[\Delta H=\Delta E+\Delta nRT\] For \[\Delta H\ne \Delta E,\Delta n\ne 0\] Where \[\Delta n\]=No, of moles of gaseous products-No. of moles of gaseous reactants (1) \[\Delta n=2-2=0\] (2) \[\Delta n=0\](\[\because \]they are either in solid or liquid state) (3) \[\Delta n=1-1=0\](\[\because \]C is in solid state) (4) \[\Delta n=2-4=-2\] Therefore, (d) is correct answer.
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