Exams › JEE Main › Chemistry

For the electrochemical cell represented as A | A+(x M) || B+(y M) | B the measured emf is +0.20 V. Which statement about the overall cell reaction is correct?

1. A+ + e- → A; B+ → B
2. The overall cell reaction cannot be determined from the given information
3. A + B+ → A+ + B
4. A+ + B → A + B+

Correct answer: The overall cell reaction cannot be determined from the given information

Solution

The measured emf provides information about the potential difference between the two half-cells, but without knowing the specific half-reactions or the concentrations of the species involved, we cannot definitively determine the overall cell reaction.

Related JEE Main Chemistry questions

• Which of the following sequences lists the given metals in decreasing order of their standard electrode potentials: Mg, K, Ba and Ca?
• During electrolysis of an aqueous solution of dipotassium succinate, which gas is evolved at the electrodes?
• Which expression gives the equivalent conductance at infinite dilution of Al2(SO4)3, if 9b°Al3+ and 9b°SO4^2− denote the equivalent conductances at infinite dilution of the corresponding ions?
• A weak monobasic acid has an equivalent conductance of 8.0 mho cm^2 for an M/32 solution, while its limiting equivalent conductance at infinite dilution is 400 mho cm^2. What is the dissociation constant of the acid?
• The standard emf of a Daniell cell is 1.10 V. What is the greatest amount of electrical work that can be extracted from this cell?
• During the recharging of a lead storage battery, which reaction takes place at the cathode?

⚔️ Practice JEE Main Chemistry free + battle 1v1 →