MHT CET · Chemistry · Electrochemistry
Which of the following net cell reaction takes place in a galvanic cell containing copper electrode and standard hydrogen electrode ?
\(\mathrm{E}^{\circ}\left(\mathrm{Cu}_{(\mathrm{aq})}^{+2} \mid \mathrm{Cu}_{(\mathrm{s})}\right)=+0 \cdot 34 \mathrm{~V}\)
- A \(\mathrm{Cu}_{(\mathrm{s})}+2 \mathrm{H}_{(\mathrm{aq})}^{+} \longrightarrow \mathrm{Cu}_{(\mathrm{aq})}^{+2}+\mathrm{H}_{2(\mathrm{~g})}\)
- B \(\mathrm{H}_{2(\mathrm{~g})}+\mathrm{Cu}_{(\mathrm{aq})}^{+2} \longrightarrow 2 \mathrm{H}_{(\mathrm{aq})}^{+}+\mathrm{Cu}_{(\mathrm{s})}\)
- C \(\mathrm{Cu}_{(\mathrm{s})}+\mathrm{H}_{2(\mathrm{~g})} \longrightarrow \mathrm{Cu}_{(\mathrm{aq})}^{+2}+2 \mathrm{H}_{(\mathrm{aq})}^{+}\)
- D \(\mathrm{Cu}_{(\mathrm{aq})}^{+2}+2 \mathrm{H}_{(\mathrm{aq})}^{+} \longrightarrow \mathrm{Cu}_{(\mathrm{s})}+\mathrm{H}_{2(\mathrm{~g})}\)
Answer & Solution
Correct Answer
(B) \(\mathrm{H}_{2(\mathrm{~g})}+\mathrm{Cu}_{(\mathrm{aq})}^{+2} \longrightarrow 2 \mathrm{H}_{(\mathrm{aq})}^{+}+\mathrm{Cu}_{(\mathrm{s})}\)
Step-by-step Solution
Detailed explanation
\(\mathrm{E}^{\circ}\left(\mathrm{Cu}_{(\mathrm{aq})}^{+2} \mid \mathrm{Cu}_{(\mathrm{s})}\right)=+0.34 \mathrm{~V}\) \(\mathrm{E}^{\circ}\left(2\mathrm{H}_{(\mathrm{aq})}^{+} \mid \mathrm{H}_{2(\mathrm{~g})}\right)=0.00 \mathrm{~V}\)
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