Question
What is the number of electrons gained by Cl atom when n mole of ClO _4^- is transformed into n mole of ClO _2^- ion?
MHT CET
Chemistry
Redox Reactions
2026
MHT CET 2026 (20 April Shift 2)
MHT CET Chemistry Question (2026) — Solution
Options
- A. 3n
- B. 4n
- C. n
- D. 2n
Answer
B. 4n
Step-by-step solution
Let the oxidation state of Cl in ClO _4^- be x. x + 4(-2) = -1 x = +7 Let the oxidation state of Cl in ClO _2^- be y. y + 2(-2) = -1 y = +3 The change in oxidation state of Cl is from +7 to +3. This means each Cl atom gains 4 electrons during the transformation. For 1 mole of ClO _4^-, 4 moles of electrons are gained. Therefore, for n moles of ClO _4^-, the number of moles of electrons gained is 4n. Answer: 4n
Related: Chemistry — Redox Reactions · All PYQ Banks