What is A in the following reaction ?...

What is A in the following reaction ?

A

`Cu_(2)Cl_(2)`

B

`H_(3)PO_(2)` and `H_(2)O`

C

`H^(+)//H_(2)O`

D

`HgSO_(4)//H_(2)SO_(4)`

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The correct Answer is:

2

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