JEE Main 2026 Chemistry question
500 mL of 0.2 M MnO₄⁻ solution in basic medium when mixed with 500 mL of 1.5 M KI solution, oxidises iodide ions to liberate molecular iodine. This liberated iodine is then titrated with a standard x M thiosulphate solution in presence of starch till the end point. If 300 mL of thiosulphate was consumed, then the value of x is .
Answer: 1
Solution
In basic medium MnO₄⁻ is reduced to MnO₂ (3 e⁻). Moles of MnO₄⁻=0.1, so electrons=0.3 mol, giving
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