A is
A) \[{{H}_{3}}P{{O}_{2}}\]
B) \[C{{U}_{2}}C{{l}_{2}}\]
C) \[HgS{{O}_{4}}/{{H}_{2}}S{{O}_{4}}\]
D) \[{{H}^{+}}/{{H}_{2}}O\]
Correct Answer: A
Solution :
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