Electrochemistry · JEE Advanced previous year questions

6 questions asked across 3 exam years, newest first

2025 2 questions

Q402025 · 18 May 2025 · Paper 1· Numerical answer
In an electrochemical cell, dichromate ions in aqueous acidic medium are reduced to $C r^{3 +}$ . The current (in amperes) that flows through the cell for 48.25 minutes to produce 1 mole of $C r^{3 +}$ is ____. $Use:$ 1 Faraday = $96500 C mo l^{- 1}$
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Answer: 100
Q462025 · 18 May 2025 · Paper 2· Numerical answer
An electrochemical cell is fueled by the combustion of butane at $1 bar$ and $298 K$ . Its cell potential is $\frac{X}{F} \times 1 0^{3} volts$ , where $F$ is the Faraday constant. The value of $X$ is _________. $Use:$ Standard Gibbs energies of formation at $298 K$ are: $Δ_{f} G_{CO_{2}}^{\circ} = - 394 kJ mol^{- 1}$ ; $Δ_{f} G_{water}^{\circ} = - 237 kJ mol^{- 1}$ ; $Δ_{f} G_{butane}^{\circ} = - 18 kJ mol^{- 1}$
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Answer: 105.4 to 105.6