In which of the following cases a chemical reaction is possible?
- A$ZnSO_{4}(aq)$ is placed in a copper vessel
- B$AgNO_{3}$ solution is stirred with a copper spoon
- CConc. $HNO_{3}$ is stored in a platinum vessel
- Dgold ornaments are washed with dil. $HCl$
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Consider the galvanic cell: $A_{(s)} | A_{(aq)}^{+2} || B_{(aq)}^{+} | B_{(s)}$. If the $EMF$ of the cell is positive,identify the correct cell reaction from the following.
Which of the following reactions occurs at the cathode during the discharging of a lead accumulator?
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