AIIMS 2017 Chemistry Redox Reactions MCQ Question
The mass of potassium dichromate crystals required to oxidise 3 750 of 0.6 M Mohr's salt solution is (Given, molar mass, potassium dichromate = 294, Mohr's salt = 392)
0.39 g
0.37 g
22.05 g
2.2 g
Correct Answer
Detailed Explanation
The calculation shows that 0.450 mol of Fe²⁺ reacts with Cr₂O₇²⁻, yielding 0.075 mol of Cr₂O₇²⁻ needed for the reaction, which corresponds to a mass of 22.05 g when multiplied by its molar mass of 294 g/mol. This demonstrates the stoichiometric relationship in the redox reaction, confirming that the mass of Cr₂O₇²⁻ required is accurately calculated. Other options are not relevant as they do not provide the correct mass or stoichiometric relationships necessary for this reaction. Understanding these calculations is crucial for mastering redox reactions and stoichiometry in chemistry.
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