A) \[{{D}_{2}},He\]
B) \[{}^{14}{{D}_{2}}C{{O}_{2}}\]
C) \[{{N}_{2}}O,N{{O}_{2}}\]
D) \[C{{H}_{4}},C{{H}_{4}}\]
Correct Answer: A
Solution :
Molecular weight is same
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