In order to concentrate galena (which contains ZnS as impurity) by froth-floatation process, sodium cyanide is used as depressant. NaCN dissolves ZnS due to formation of water soluble complex (A).Find w+xy+zWhere w = coordination number of central metal ion in complex ion of (A)x = number of unpaired electrons in (A) y = total number of possible linkage isomers of (A) including (A)z = maximum number of atoms in a single plane in the complex ion of (A)