Four successive members of the first series of the transition metals are listed below. For which one of them is the standard electrode potential $(E^o_{M^{2+}/M})$ value positive?

The common oxidation state of scandium $(Sc)$,a transition element,is:

Which of the following electronic configurations of a transition metal atom shows the highest oxidation state?

The yellow colour of chromate ion and orange colour of dichromate ion is due to

Which of the following ions has electronic configuration $[Ar]3d^6$ ?
(At. nos. $Mn = 25, Fe = 26, Co = 27, Ni = 28$)

Given below are two statements :
Statement $I$ : The higher oxidation states are more stable down the group among transition elements unlike $p-$block elements.
Statement $II$ : Copper can not liberate hydrogen from weak acids.
In the light of the above statements,choose the correct answer from the options given below :