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Chem MC question on metal

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ling c 0202
 
Reply Sun 8 Jan, 2006 02:36 am
Which of the following combinations is INCORRECT?

Metal Method of extraction

A. Aluminium Electrolysis of molten ore
B. Copper Controlled heating in air
C. Iron Heating with Carbon
D. Silver Heating with Carbon


I don't know why the correct answer is D.

Also, i don't understand what means by "Controlled heating in air"?
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