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Q.

Which of the following reactions show the process of smelting ?

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a

2PbO + PbS → 3Pb + SO2

b

2HgS + 3O2 → 2HgO + 2SO2

c

2Na[Au(CN)2] + Zn → Na2[Zn(CN)4] + 2Au

d

PbO + C → Pb + CO

answer is C.

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Detailed Solution

  • Smelting is the process of reducing the roasted metallic oxide to a metal. In this process, impurities are removed by the addition of appropriate flux.
  •  It reduces the oxide ore to metals in its molten state.
  • Carbon reduction occurs in smelting from oxide ore. 
  • PbO + C ⟶ Pb + CO
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