Question
What is the quantity of electricity required to produce 8 g of Mg (molar mass = 24\ g mol ^ -1 ) from MgCl _2 solution ?
MHT CET
Chemistry
Electrochemistry
2026
MHT CET 2026 (20 April Shift 1)
MHT CET Chemistry Question (2026) — Solution
Options
- A. 0.222 F
- B. 0.444 F
- C. 0.666 F
- D. 0.888 F
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
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