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)

Answer

D

Explanation

(6.47)
`PbS+O_(2) to PbSO_(2)`
`(1000)/(32)mol (1000)/(32) xx207 gm`
mol of Pb= mol of`O_(2)`
`=(10000)/(32)` mol
`:.` Mass of Pb `=(1000)/(32)xx207g`
`=(207)/(32)kg =6.47 `kg