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In which of the following cases a chem...

In which of the following cases a chemical reaction is possible ?

A

Conc. `HNO_(3)` is stored in a platinum vessel .

B

gold ornaments are washed with dil HCl

C

`ZnSO_(4(aq))` is placed in copper vessel

D

`AgNO_(3)` solution is stirred with a copper spoon .

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