Question

1.
2.
3.
4.
Answer (Detailed Solution Below)

Option 3 : $1.0$ / 1.0

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Detailed Solution

सही उत्तर $1.0$ / 1.0 है।

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Question:

In the cell $\mathrm{Pt}|\mathrm{H_2}(1\ \mathrm{atm})|\mathrm{H^+}(x\ \mathrm{M})||\mathrm{Cu^{2+}}(1\ \mathrm{M})|\mathrm{Cu}$, the measured EMF is $0.399\ \mathrm{V}$ at 298 K. Given $E^\circ_{\mathrm{Cu^{2+}/Cu}}=0.34\ \mathrm{V}$, the pH of the hydrogen half-cell solution is / सेल $\mathrm{Pt}|\mathrm{H_2}(1\ \mathrm{atm})|\mathrm{H^+}(x\ \mathrm{M})||\mathrm{Cu^{2+}}(1\ \mathrm{M})|\mathrm{Cu}$ में 298 K पर मापा गया EMF $0.399\ \mathrm{V}$ है। $E^\circ_{\mathrm{Cu^{2+}/Cu}}=0.34\ \mathrm{V}$ दिया गया है, तो हाइड्रोजन अर्ध-सेल विलयन का pH है

1.
$2.0$ / 2.0
2.
$-1.0$ / −1.0
3.
$1.0$ / 1.0
4.
$0.5$ / 0.5

Correct Answer: $1.0$ / 1.0

By the Nernst equation $E=E^\circ+0.05916\,\mathrm{pH}$, so $\mathrm{pH}=(0.399-0.34)/0.05916=1.0$. / नेर्न्स्ट समीकरण से $E=E^\circ+0.05916\,\mathrm{pH}$, अतः $\mathrm{pH}=(0.399-0.34)/0.05916=1.0$।

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