In the equation:
`M+8CN^(-)+2H_(2)O+O_(2)to4[M(CN)_(2)]^(-)+4OH^(-)` metal M is:

In the equation , 4M +8CN^(-) +2H_2O+O_2 rarr 4[M(CN)_2]^(-)+4OH^(-) , the metal M is

Name the metal M, which is extracted based on the following equation 4M +8CN^(-) + 2H_(2) O + O_(2) to 4 [M (CN)_(2)]^(-) + 4OH^(-) 2[M (CN)_(2) ]^(-) + Zn to [Zn(CN)_(4)]^(2) + 2M