KCET · Chemistry · Electrochemistry
In which of the following cases a chemical reaction is possible?
- 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. \(\mathrm{HCl}\)
Answer & Solution
Correct Answer
(B) \(\mathrm{AgNO}_{3}\) solution is stirred with a copper spoon
Step-by-step Solution
Detailed explanation
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,
\(2 \mathrm{AgNO}_{3}+\mathrm{Cu} \longrightarrow \mathrm{Cu}\left(\mathrm{NO}_{3}\right)_{2}+2 \mathrm{Ag}\)
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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