Which of the following reactions show the process of smelting?

Chemistry · JEE Advanced · NTA Exams — General Principles and Processes of Isolation of Elements

1. 2PbO + PbS \(\text { → }\)3Pb + SO₂
2. \(2 \mathrm{Na}\left[\mathrm{Au}(\mathrm{CN})_{2}\right]+\mathrm{Zn} \rightarrow \mathrm{Na}_{2}\left[\mathrm{Zn}(\mathrm{CN})_{4}\right]+2 \mathrm{Au}\)
3. \(\mathrm{PbO}+\mathrm{C} \rightarrow \mathrm{~Pb}+\mathrm{CO}\)
4. \(2 \mathrm{HgS}+3 \mathrm{O}_{2} \rightarrow 2 \mathrm{HgO}+2 \mathrm{SO}_{2}\)

Answer

(C) PbO + C ~Pb + CO

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