MHT CET202620 April 2026Morning ShiftChemistryElectrochemistryActual
What is the quantity of electricity required to produce 8 g of Mg (molar mass = 24 g mol ⁻¹ ) from MgCl ₂ solution ?
Options
- A0.222 F
- B0.444 F
- C0.666 F
- D0.888 F
Correct answer
C. 0.666 F
Step-by-step solution
The reduction reaction of magnesium is given by: Mg ²⁺ + 2e⁻ Mg From the stoichiometry of the reaction, 1 mole of Mg requires 2 moles of electrons, which corresponds to 2 F of electricity. Number of moles of Mg to be produced = Mass Molar mass = 8 24 = 1 3 mol Quantity of electricity required = 1 3 2 F = 2 3 F = 0.666 F Answer: 0.666 F