JEE Main 2024 Chemistry question

ChemistryElectrochemistryJEE Main 2024

The standard reduction potentials at 298 K for the following half cells are given below : Cr₂O₇²⁻ + 14H⁺ + 6e⁻ → 2Cr³⁺ + 7H₂O, E° = 1.33 V; Fe³⁺(aq) + 3e⁻ → Fe, E° = −0.04 V; Ni²⁺(aq) + 2e⁻ → Ni, E° = −0.25 V; Ag⁺(aq) + e⁻ → Ag, E° = 0.80 V; Au³⁺(aq) + 3e⁻ → Au, E° = 1.40 V. Consider the given electrochemical reactions, the number of metal(s) which will be oxidized by Cr₂O₇²⁻, in aqueous solution is .

Answer: 3

Solution

Dichromate (E° = 1.33 V) oxidises those metals whose reduction potential is lower

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Question ID VK-016528