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In the following the missing product is ...

In the following the missing product is `Na[Ag(CN)_2] + Zn rarr Ag +...........`

A

`Na[Zn(CN)_2]`

B

`Na_4[Zn(CN)_6]`

C

`Na_2[Zn(CN)_4]`

D

`Na_3[Zn(CN)_3]`

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