which of the following processes involve...

which of the following processes involve smelting

A

`ZnCO_(3)overset("Heat")toZnO+CO_(2)`

B

`2PbS+3O_(2)overset("Heat")to2PbO+2SO_(2)`

C

`Al_(2)O_(3).2H_(2)Ooverset("Heat")toAl_(2)O_(3)+2H_(2)O`

D

`Fe_(2)O_(3)+3Coverset("Heat")to2Fe+3CO`

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The correct Answer is:

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