Electrochemistry NEET PYQs (1992–2026)

Solved Electrochemistry PYQs

3 recent questions with answers. The full set of 79 is free to practise.

1. NEET 2026EasyConductivity and Cell Constant
   Q1

   For a salt XY, which is a strong electrolyte, the plot of ${\Lambda }_m$ versus $\sqrt{c}$ has a slope of $-90.0{\text{ S cm}}^2{\text{ mol}}^{-3/2}{\text{ L}}^{1/2}$ at $298\text{ K}$. At $0.01\text{ M}$ concentration of XY, the value of ${\Lambda }_m$ is $45.0{\text{ S cm}}^2{\text{ mol}}^{-1}$. The limiting molar conductivity of $Y^{-}$ ion $({\lambda }_Y^0$, in ${Scm}^2{\text{ mol}}^{-1}$) at $298\text{ K}$ will be: (Given: ${\lambda }_X^0=74.0{\text{ S cm}}^2{\text{ mol}}^{-1}$)

   • A80.0
   • B100.0
   • C90.0
   • D76.0

   Show answer & solution

   Correct answer: (A)

   Kohlrausch's law: ${\Lambda }_m={\Lambda }_m^0-A\sqrt{c}$.
   
   $${\Lambda }_m^0={\Lambda }_m+A\sqrt{c}=145+90\times \sqrt{0.01}=145+9=154$$
   
   S cm² mol^-1.
   
   ${\Lambda }_m^0={\lambda }_X^0+{\lambda }_Y^0$.
   
   ${\lambda }_Y^0=154-74=80$ S cm² mol^-1.
2. NEET 2026MediumElectrode Potentials
   Q2

   A solution of copper sulphate is electrolysed for 10 minutes with a current of 1.5 amperes. The mass of copper deposited at cathode is: Given: Molar mass of Cu = 63 g mol^-1, 1 F = 96487 C mol^-1

   • A$1.7018g$
   • B$0.2938g$
   • C$2.4036g$
   • D$0.5876g$

   Show answer & solution

   Correct answer: (2)

   $W=\frac{EIt}{96500}$ where E = 63/2 = 31.5 (since Cu²⁺).
   
   $t=10\times 60=600$ s.
   
   $W=\frac{31.5\times 1.5\times 600}{96500}=\frac{28350}{96500}=0.2938$ g.
3. NEET 2026MediumGibbs Energy and Cell Potential
   Q3

   The standard electrode potential $\left(E^{\circ }\right)$ for the half-cell
   
   reaction Fe³⁺ + e^- → Fe²⁺ at 298 K is:
   
   (Given: $E^{\circ }\left({Fe}^{3+}/Fe\right)=-0.04$ V and
   
   $E^{\circ }\left({Fe}^{2+}/Fe\right)=-0.44$ V at 298 K)

   • A$+0.40$ V
   • B$+0.76$ V
   • C$-0.48$ V
   • D$+0.92$ V

   Show answer & solution

   Correct answer: (B)

   Fe³⁺ + 3e^- → Fe: $E_1^{\circ }=-0.04$ V,
   
   $\Delta G_1^{\circ }=-3F(-0.04)=+0.12F$.
   
   Fe²⁺ + 2e^- → Fe: $E_2^{\circ }=-0.44$ V,
   
   $\Delta G_2^{\circ }=-2F(-0.44)=+0.88F$.
   
   Fe³⁺ + e^- → Fe²⁺:
   
   $\Delta G^{\circ }=\Delta G_1^{\circ }-\Delta G_2^{\circ }=0.12F-0.88F=-0.76F$.
   
   $$E^{\circ }=-\frac{\Delta G^{\circ }}{nF}=-\frac{-0.76F}{1F}=+0.76$$
   
   V.

Topic-wise question count

Where NEET has asked from Electrochemistry, most frequent first.

• Electrode Potentials23
• Faraday's Laws12
• Conductance11
• Conductivity and Cell Constant8
• Gibbs Energy and Cell Potential8
• Electrochemical Cells5
• Nernst Equation4
• Electrolysis4
• Batteries3
• Corrosion1

Year-wise Electrochemistry questions in NEET

Number of questions from this chapter in each year's paper(s).