MHT CET 2025 26th April Evening Shift | Electrochemistry Question 2 | Chemistry

What happens to the emf for the cell, ${ }^{-} \mathrm{Zn}_{(\mathrm{s})}\left|\mathrm{Zn}_{(1 \mathrm{M})}^{+2} \| \mathrm{Ag}^{+1}(1 \mathrm{M})\right| \mathrm{Ag}_{(\mathrm{s})}^{+}$if concentration of $\mathrm{Ag}^{+1}$ decreases to 0.1 M ?

increase by 0.0592 V

decrease by 0.0592 V

increase by 0.0296 V

decrease by 0.0296 V

MHT CET 2025 26th April Evening Shift

MCQ (Single Correct Answer)

-0

Which of the following net cell reaction takes place in a galvanic cell containing copper electrode and standard hydrogen electrode?

$$ \mathrm{E}^{o}\left(\mathrm{Cu}_{(\mathrm{aq})}^{+2} \mid \mathrm{Cu}_{(\mathrm{s})}\right)=+0.34 \mathrm{~V} $$

$\mathrm{Cu}_{(\mathrm{s})}+2 \mathrm{H}_{(\mathrm{aq})}^{+} \longrightarrow \mathrm{Cu}_{(\mathrm{aq})}^{+2}+\mathrm{H}_{2(\mathrm{~g})}$

$\mathrm{H}_{2(\mathrm{~g})}+\mathrm{Cu}_{(\mathrm{aq})}^{+2} \longrightarrow 2 \mathrm{H}_{(\mathrm{aq})}^{+}+\mathrm{Cu}_{(\mathrm{s})}$

$\mathrm{Cu}_{(\mathrm{s})}+\mathrm{H}_{2(\mathrm{~g})} \longrightarrow \mathrm{Cu}_{(\mathrm{aq})}^{+2}+2 \mathrm{H}_{(\mathrm{aq})}^{+}$

$\quad \mathrm{Cu}_{(\mathrm{aq})}^{+2}+2 \mathrm{H}_{(\mathrm{aq})}^{+} \longrightarrow \mathrm{Cu}_{(\mathrm{s})}+\mathrm{H}_{2(\mathrm{~g})}$

MHT CET 2025 26th April Morning Shift

MCQ (Single Correct Answer)

-0

Which of the following changes takes place at positive electrode during recharging of lead accumulator?

$\quad \mathrm{Pb}$ is oxidised to $\mathrm{PbSO}_4$

$\quad \mathrm{PbSO}_4$ is oxidised to $\mathrm{PbO}_2$

$\mathrm{PbSO}_4$ is reduced to Pb

$\mathrm{PbO}_2$ is reduced to $\mathrm{PbSO}_4$

MHT CET 2025 26th April Morning Shift

MCQ (Single Correct Answer)

-0

For the cell reaction, $\mathrm{A}_{(\mathrm{s})}+\mathrm{B}_{(\mathrm{eq})}^{+_2} \longrightarrow \mathrm{~A}_{(\mathrm{eq})}^{+_2}+\mathrm{B}_{(\mathrm{s})}$ if equilibrium constant of reaction is $10^4$ at 298 K . What is standard emf of cell?

0.0592 V

0.1184 V

0.1776 V

0.2368 V

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