A) \[2{{H}_{2}}+{{O}_{2}}\xrightarrow{{}}2{{H}_{2}}O\]
B) \[{{N}_{2}}\text{+}3{{H}_{2}}\xrightarrow{{}}2N{{H}_{3}}\]
C) \[2Cu+S\xrightarrow{{}}C{{u}_{2}}S\]
D) \[{{H}_{2}}+{{I}_{2}}\xrightarrow{{}}2HI\]
Correct Answer: D
Solution :
Those reaction for which \[{{H}_{2}}+{{I}_{2}}2HI\] \[\Delta n=2-2=0\]
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