1.

Match the column - I with column - II {:(,"List - I",,"List - II"),((P),PbS rarr PbO,(1),"roasting"),((Q),CaCO_(3) rarr CaO,(2),"calcination"),((R),ZnS rarr Zn,(3),"Carbon reduction"),((S),Cu_(2)S rarr Cu,(4),"self reduction"):}

Answer»

<P>`{:(P,Q,R,S),(1,2,"1,3","1,4"):}`
`{:(P,Q,R,S),(2,3,1,4):}`
`{:(P,Q,R,S),(2,3,4,1):}`
`{:(P,Q,R,S),(3,4,2,1):}`

ANSWER :A


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