MHT CET 2025 20th April Morning Shift | Electrochemistry Question 19 | Chemistry

Standard potential $\left(\mathrm{E}^{\circ}\right)$ of $\mathrm{Zn}_{(\mathrm{aq})}^{+2}+2 \mathrm{e}^{-} \longrightarrow \mathrm{Zn}_{(\mathrm{s})}$ is -0.76 V .

What is standard potential of reaction $2 \mathrm{Zn}_{(\mathrm{s})} \longrightarrow 2 \mathrm{Zn}_{(\mathrm{aq})}^{+2}+4 \mathrm{e}^{-}$?

-1.52 V

+1.52 V

-0.76 V

+0.76 V

MHT CET 2025 20th April Morning Shift

MCQ (Single Correct Answer)

-0

Which from following formulae is used to obtain value of $\mathrm{E}_{\text {cell }}^r$ for a reaction taking place in Dry cell?

$\frac{-\Delta \mathrm{G}^{\circ}}{\mathrm{F}}$

$\frac{-\Delta G^{\circ}}{2 F}$

$\frac{-\Delta \mathrm{G}^{\circ}}{3 \mathrm{~F}}$

$\frac{-\Delta G^{\circ}}{4 F}$

MHT CET 2025 19th April Evening Shift

MCQ (Single Correct Answer)

-0

For a Galvanic cell consisting zinc electrode and standard hydrogen electrode,

$$ \mathrm{E}^{\mathrm{o}}\left(\mathrm{Zn}_{(\mathrm{aq})}^{+2} \mid \mathrm{Zn}_{(\mathrm{s})}\right)=-0.76 \mathrm{~V} $$

Identify the reaction that takes place at positive electrode during working of cell?

$\mathrm{Zn}_{(\mathrm{s})} \longrightarrow \mathrm{Zn}_{(\mathrm{aq})}^{+2}+2 \mathrm{e}^{-}$

$\mathrm{Zn}_{(\mathrm{aq})}^{+2}+2 \mathrm{e}^{-} \longrightarrow \mathrm{Zn}_{(\mathrm{s})}$

$\quad \mathrm{H}_{2(\mathrm{~g})} \longrightarrow 2 \mathrm{H}_{(\mathrm{g})}^{+}+2 \mathrm{e}^{-}$

$\quad 2 \mathrm{H}_{(\mathrm{g})}^{+}+2 \mathrm{e}^{-} \longrightarrow \mathrm{H}_{2(\mathrm{~g})}$

MHT CET 2025 19th April Evening Shift

MCQ (Single Correct Answer)

-0

What is the number of faraday required to form $1 \mathrm{~mol} \mathrm{H}_2$ by reduction of $\mathrm{H}^{+}$ions?

0.5

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