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JEE Mains · Chemistry · STD 12 - 2. Electrochemistry

कुछ अर्ध-सेलों के मानक इलेक्ट्रोड विभव नीचे दिए गए हैं :
\(\begin{aligned}
& \mathrm{E}_{\mathrm{Cu}^{2+} / \mathrm{Cu}}^{\circ}=0.34 \mathrm{~V}, \mathrm{E}_{\mathrm{Zn}^{2+} / \mathrm{Zn}}^{\circ}=-0.76 \mathrm{~V} \\
& \mathrm{E}_{\mathrm{Ag}^{+} / \mathrm{Ag}}^{\circ}=0.80 \mathrm{~V}, \mathrm{E}_{\mathrm{Mg}^{2+} / \mathrm{Mg}}^{\circ}=-2.37 \mathrm{~V}
\end{aligned}\)
निम्नलिखित में से कौन-सा सेल \(\Delta \mathrm{G}^{\circ}\) का सर्वाधिक ऋणात्मक मान देता है ?

  1. A \(\mathrm{Zn}\left|\mathrm{Zn}^{2+}(1 \mathrm{M})\right|\left|\mathrm{Ag}^{+}(1 \mathrm{M})\right| \mathrm{Ag}\)
  2. B \(\mathrm{Zn}\left|\mathrm{Zn}^{2+}(1 \mathrm{M})\right|\left|\mathrm{Mg}^{2+}(1 \mathrm{M})\right| \mathrm{Mg}\)
  3. C \(\mathrm{Ag}\left|\mathrm{Ag}^{+}(1 \mathrm{M})\right|\left|\mathrm{Mg}^{2+}(1 \mathrm{M})\right| \mathrm{Mg}\)
  4. D \(\mathrm{Cu}\left|\mathrm{Cu}^{2+}(1 \mathrm{M}) \| \mathrm{Ag}^{+}(1 \mathrm{M})\right| \mathrm{Ag}\)
Verified Solution

Answer & Solution

Correct Answer

(A) \(\mathrm{Zn}\left|\mathrm{Zn}^{2+}(1 \mathrm{M})\right|\left|\mathrm{Ag}^{+}(1 \mathrm{M})\right| \mathrm{Ag}\)

Step-by-step Solution

Detailed explanation

\(\because \Delta \mathrm{G}^{\circ}=-\mathrm{nFE}^{\circ}\) विकल्प (1) \(\mathrm{E}^{\circ}=0.8+0.76\) \(\begin{aligned} & =1.56 \mathrm{~V} \\ \therefore \Delta \mathrm{G}^{\circ} & =-2 \times \mathrm{F} \times 1.56 \\ & =-3.12 \mathrm{~V}\end{aligned}\) विकल्प (2)…
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