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B
A. ⟶ p, r; B. ⟶ p; C. ⟶ q; D. ⟶ s.
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C
A. ⟶ p, r; B. ⟶ s; C. ⟶ q; D. ⟶ s.
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D
A. ⟶ r; B. ⟶ p,s; C. ⟶ q; D. ⟶ s.
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Solution
The correct option is B A. ⟶ p, r; B. ⟶ p; C. ⟶ q; D. ⟶ s. Self-reduction is exhibited by both lead and copper. PbS+2PbO→3Pb+SO2 Cu2S+2Cu2O→6Cu+SO2
Surprisingly, lead also undergoes carbon reduction! The MacArthur-Forrest process is used for the hydrometallurgical extraction or refining of Silver and Gold.
As for boron, it's iodide is unstable above a particular temperature. So crude metal is converted into its iodide (in a sealed container) and then the iodide is decomposed by heating to get pure metal.