JEE Main 2025 (Online) 29th January Morning Shift | Electrochemistry Question 3 | Chemistry

JEE Main 2025 (Online) 29th January Morning Shift

MCQ (Single Correct Answer)

-1

For a Mg | Mg²⁺ (aq) || Ag⁺ (aq) | Ag the correct Nernst Equation is :

$\mathrm{E}_{\text {cell }}=\mathrm{E}_{\text {cell }}^{\mathrm{o}}-\frac{\mathrm{RT}}{2 \mathrm{~F}} \ln \frac{\left[\mathrm{Ag}^{+}\right]^2}{\left[\mathrm{Mg}^{2+}\right]}$

$\mathrm{E}_{\text {cell }}=\mathrm{E}_{\text {cell }}^{\mathrm{o}}-\frac{\mathrm{RT}}{2 \mathrm{~F}} \ln \frac{\left[\mathrm{Mg}^{2+}\right]}{\left[\mathrm{Ag}^{+}\right]}$

$\mathrm{E}_{\text {cell }}=\mathrm{E}_{\text {cell }}^{\mathrm{o}}-\frac{\mathrm{RT}}{2 \mathrm{~F}} \ln \frac{\left[\mathrm{Ag}^{+}\right]}{\left[\mathrm{Mg}^{2+}\right]}$

$\mathrm{E}_{\text {cell }}=\mathrm{E}_{\text {cell }}^{\mathrm{o}}+\frac{\mathrm{RT}}{2 \mathrm{~F}} \ln \frac{\left[\mathrm{Ag}^{+}\right]^2}{\left[\mathrm{Mg}^{2+}\right]}$

JEE Main 2025 (Online) 29th January Morning Shift

MCQ (Single Correct Answer)

-1

The molar conductivity of a weak electrolyte when plotted against the square root of its concentration, which of the following is expected to be observed?

Molar conductivity increases sharply with increase in concentration.

Molar conductivity decreases sharply with increase in concentration.

A small increase in molar conductivity is observed at infinite dilution.

A small decrease in molar conductivity is observed at infinite dilution.

JEE Main 2025 (Online) 29th January Morning Shift

MCQ (Single Correct Answer)

-1

The standard reduction potential values of some of the p-block ions are given below. Predict the one with the strongest oxidising capacity.

$E^o_{\text{Sn}^{4+}/\text{Sn}^{2+}} = +1.15 \text{ V}$

$E^o_{\text{Al}^{3+}/\text{Al}} = -1.66 \text{ V}$

$E^o_{\text{Pb}^{4+}/\text{Pb}^{2+}} = +1.67 \text{ V}$

$E^o_{\text{Tl}^{3+}/\text{Tl}} = +1.26 \text{ V}$

JEE Main 2025 (Online) 24th January Evening Shift

MCQ (Single Correct Answer)

-1

Based on the data given below :

$$\begin{array}{ll} \mathrm{E}_{\mathrm{Cr}_2 \mathrm{O}_7^{2-} / \mathrm{Cr}^{3+}}^{\circ}=1.33 \mathrm{~V} & \mathrm{E}_{\mathrm{Cl}_2 / \mathrm{Cl}^{(-)}}^{\circ}=1.36 \mathrm{~V} \\ \mathrm{E}_{\mathrm{MnO}_4^{-} / \mathrm{Mn}^{2+}}^0=1.51 \mathrm{~V} & \mathrm{E}_{\mathrm{Cr}^{3+} / \mathrm{Cr}}^{\circ}=-0.74 \mathrm{~V} \end{array}$$

the strongest reducing agent is :

$\mathrm{Cl}^{-}$

$\mathrm{MnO}_4^{-}$

$\mathrm{Cr}$

$\mathrm{Mn}^{2+}$

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