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Galena (an ore) is partially oxidized by passing air through it at high temperatures. After some time, the passage of air is stopped, but the heating is continued in a closed furnace such that the contents undergo self-reduction. The weight (in kg) of Pb produced per kg of O₂ consumed is __. (Atomic weights in g mol^-1 : O = 16, S = 32, Pb = 207)

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answer is 6.

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Detailed Solution

The reaction can be as follows:
PbS + O₂ → Pb + SO₂

Moles of Pb = Moles of O₂ = 1000 / 32 mol

∴ Mass of Pb = 1000 / 32 × 207 g = 207 / 32 kg = 6.47 kg

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