$E^o$ of $Cu$ is $+0.34\,V$ while that of $ Zn$ is  $-\,0.76\,V$. Explain

Which is heaviest among the following

Reactivity of transition elements decreases almost regularly from $Sc$ to $Cu$. Explain.

A transition metal ' $\mathrm{M}$ ' among $\mathrm{Sc}, \mathrm{Ti}, \mathrm{V}, \mathrm{Cr}, \mathrm{Mn}$ and $\mathrm{Fe}$ has the highest second ionisation enthalpy. The spin only magnetic moment value of $\mathrm{M}^{+}$ion is. . . . . . .$\mathrm{BM}$ (Near integer)

(Given atomic number $\mathrm{Sc}: 21, \mathrm{Ti}: 22, \mathrm{~V}: 23, \mathrm{Cr}$ : $24, \mathrm{Mn}: 25, \mathrm{Fe}: 26)$

The spin only magnetic moment value of the ion among $\mathrm{Ti}^{2+}, \mathrm{V}^{2+}, \mathrm{Co}^{3+}$ and $\mathrm{Cr}^{2+}$, that acts as strong oxidising agent in aqueous solution is .......... BM (Near integer).

(Given atomic numbers: $\mathrm{Ti}: 22, \mathrm{~V}: 23, \mathrm{Cr}: 24$, Co: $27$)

Which of the following statements is incorrect?