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Question: Answered & Verified by Expert
In which of the following cases a chemical reaction is possible?
ChemistryElectrochemistryKCETKCET 2020
Options:
  • A $\mathrm{ZnSO}_{4}(a q)$ is placed in a copper vessel
  • B $\mathrm{AgNO}_{3}$ solution is stirred with a copper spoon
  • C Conc. $\mathrm{HNO}_{3}$ is stored in a platinum vessel
  • D gold ornaments are washed with dil. $\mathrm{HCl}$
Solution:
2200 Upvotes Verified Answer
The correct answer is: $\mathrm{AgNO}_{3}$ solution is stirred with a copper spoon
A chemical reaction is possible when $\mathrm{AgNO}_{3}$ solution is stirred with copper spoon as copper has lesser positive value of standard electrode reduction potential as compared to Ag.
The reaction will be,
$2 \mathrm{AgNO}_{3}+\mathrm{Cu} \longrightarrow \mathrm{Cu}\left(\mathrm{NO}_{3}\right)_{2}+2 \mathrm{Ag}$

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