MCQ
The reduction potential of hydrogen half-cell will be negative if :
- A$p(H_2) = 1\,atm$ and $[H^+] = 2.0\,M$
- B$p(H_2) = 1\,atm$ and $[H^+] = 1.0\,M$
- ✓$p(H_2) = 2\,atm$ and $[H^+] = 1.0\,M$
- D$p(H_2) = 2\,atm$ and $[H^+] = 2.0\,M$
$E=E^{\circ}-\frac{0.059}{1} \log \frac{P_{H_{2}}^{1 / 2}}{\left|H^{+1}\right|}$
Now if $P_{H_{2}}=2$ atm and $\left[H^{+}\right]=1 M$
then $E=0-\frac{0.059}{1} \log \frac{2^{1 / 2}}{1}=-2$
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| List $I$ (Spectral Series for Hyddrogen) | List $II$ (Spectral Region/Higher Energy State) |
| $A$. Lyman | $I$. Infrared region |
| $B$. Balmer | $II$. $UV$ region |
| $C$. Paschen | $III$. Infrared region |
| $D$. Pfund | $IV$. Visible region |
Choose the correct answer from the options given below :-
(Molal depression constant for water is $1.80\, K\, kg\,mol ^{-1}$ and molar mass of $KCl$ is $74.6 \,g\, mol ^{-1}$ )