COMEDK202510 May 2025Morning ShiftChemistryRedox ReactionsActual
Choose the correct statement.
Options
- ACalcium and Magnesium metals are manufactured by electrolysis of aqueous solutions of their salts
- BThe oxo-anion ClO ₃⁻ does not undergo disproportionation reaction
- CNitride ion ( N ⁻³ ) cannot act as an oxidising agent
- DIn alkaline medium the reduction of MnO ₄⁻ ion involves gain of 5 electrons
Correct answer
C. Nitride ion ( N ⁻³ ) cannot act as an oxidising agent
Step-by-step solution
Calcium and Magnesium are highly reactive metals with standard reduction potentials more negative than that of water. Electrolysis of their aqueous salt solutions results in the evolution of hydrogen gas at the cathode rather than the deposition of the metal. Therefore, they are manufactured by the electrolysis of their molten chloride salts. The chlorate ion ClO ₃⁻ contains chlorine in the +5 oxidation state. It can undergo disproportionation into chloride ( -1 ) and perchlorate ( +7 ) ions, especially in acidic o