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Which of the following process involves smelting

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Which of the following process involves smelting
A. `2PbS +3O_(2) rarr 2PbO + 2SO_(2) uarr`
B. `AI_(2) O_(3).2H_(2)O rarr AI_(2)O_(3) + 2H_(2)O`
C. `Fe_(2)O_(3) +CO rarr 2Fe +2CO_(2)`
D. `Cr_(2)O_(3) + 2AI + AI_(2) O_(3) +2Cr +Heat`
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Correct Answer - C
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