Match the conversions in column-I with the type(s) of reaction (s) given in column-II.

Column-I	Column-II
P)$Pbs\to PbO$	1)Roasting
Q)$CaC{O}_3\to CaO$	2)Calcination
R)$ZnS\to Zn$	3)Carbon reduction
S)$C{u}_{2}S\to Cu$	4)Self reduction