MHT CET Chemistry Question (2026) — Solution

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In cell A, ferrous chloride ( FeCl _2) contains iron in the +2 oxidation state. The reduction reaction is: Fe ^ 2+ + 2e^ - Fe The equivalent weight of iron in cell A is E_A = M 2 , where M is the atomic mass of iron. In cell B, ferric chloride ( FeCl _3) contains iron in the +3 oxidation state. The reduction reaction is: Fe ^ 3+ + 3e^ - Fe The equivalent weight of iron in cell B is E_B = M 3 . According to Faraday's second law of electrolysis, the mass of a substance deposited by the same quantity of electricity is directly proportional to its equivalent weight. Thus, the ratio of the mass of iron deposited in cell A to that in cell B is: m_A m_B = E_A E_B = M 2 M 3 = 3 2 The ratio is 3:2. Answer: 3:2