The same current is passed through acidulated water and stannous chloride solution. What volume of dry detonating gas at 0°C and 1 atm is evolved from water, when 1.20 g of tin is deposited from the o

Question

The same current is passed through acidulated water and stannous chloride solution. What volume of dry detonating gas at 0°C and 1 atm is evolved from water, when 1.20 g of tin is deposited from the other solution? (Sn = 120)

Prashant Kotian · Accepted Answer

Correct answer: B. Moles of Sn deposited = 1.20 / 120 = 0.01 mol. Since Sn is in the +2 state, equivalents = 0.01 * 2 = 0.02 eq. For water, 0.02 eq of H2 (0.01 mol) and 0.02 eq of O2 (0.005 mol) are evolved. Total moles of 'detonating gas' (H2 + O2) = 0.01 + 0.005 = 0.015 mol. Volume at STP = 0.015 * 22400 ml = 336 ml. Therefore, correct answer is B.

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