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Which of the following reactions show the process of smelting ?

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Which of the following reactions show the process of smelting ?
A. `2PbO+ PbS to 3Pb + SO_(2)`
B. `2Na[Au)CN)_(2)]+Zn to Na_(2) [Zn(CN)_(4)]+2Au`
C. `PbO + C to Pb + CO`
D. `2HgS + 3O_(2) to 2HgO + 2SO_(2)`
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Correct Answer - C
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