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CGP EDU Academic Team
Published on: August 14, 2026
Galena (an ore) is partially oxidized by passing air through it at high temperature. 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 O 2 consumed is _____. (Atomic weights in g mol –1 : O = 16, S = 32, Pb = 207)
Text Solution
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6.47 kg
Sol. PbS + O 2 ⎯→ Pb + SO 2
Mole 
Moles of Pb formed = 
∴ Mass of Pb formed = 
= 6468.75 gm = 6.46875 kg = 6.47 kg
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