Consider the following reduction processes : `Zn^(2+)+2e^(-)toZn(s), E^(o)=-0.76 V`

Consider the following reduction processes : `Zn^(2+)+2e^(-)toZn(s), E^(o)=-0.76 V` `Ca^(2+)+2e^(-)toCa(s),E^(o)=-2.87 V` `Mg^(2+)+2e^(-)toMg(s),E^(o)=-2.36 V` `Ni^(2+)+2e^(-)toNi(s), E^(o)=-0.25 V The reducing power of the metals increases in the order :