1.

The methods cheifly used for the extraction of lead and zinc from their ores are respectively

Answer»

self-reduction and carbon reduction. 
carbon reduction and self-reduction. 
CYANIDE PROCESS and carbon reduction. 
carbon reduction and cyanide process. 

Solution :`{:(2Pbs + 3O_2 ,to, 2PbO + 2SO_2),(2PbO + PbS , to , 3Pb + SO_2):}}`Self-reduction
`{:(2PbO + PbS ,to , 3Pb + SO_2),(,," "darrc),(,,ZN + CO):}}`Carbon reduction


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