Which of the following is the correct sequence of atomic weights of given elements

In the first transition series, the highest $B.P. $ and $M.P.$ is of

For $M ^{2+} / M$ and $M ^{3+} / M ^{2+}$ systems, the ${E^\Theta }$ values for some metals are as follows:

$Cr ^{2+} / Cr \,-0.9 \,V$

$Cr ^{3} / Cr ^{2+}\,-0.4 \,V$

$Mn ^{2+} / Mn \,-1.2\, V$

$Mn ^{3+} / Mn ^{2+}\,+1.5 \,V$

$Fe ^{2+} / Fe\, -0.4 \,V$

$Fe ^{3+} / Fe ^{2+}\,+0.8\, V$

Use this data to comment upon:

$(i)$ The stability of $Fe ^{3+}$ in acid solution as compared to that of $Cr ^{3+}$ or $Mn ^{3+}$ and

$(ii)$ The ease with which iron can be oxidised as compared to a similar process for either chromium or manganese metal.

The set of correct statements is:

$(i)$ Manganese exhibits $+7$ oxidation state in its oxide.

$(ii)$ Ruthenium and Osmium exhibit $+8$ oxidation in their oxides.

$(iii)$ $Sc$ shows $+4$ oxidation state which is oxidizing in nature.

$(iv)$ $Cr$ shows oxidising nature in $+6$ oxidation state.

Which of the following magnetic moment values will corresponds to highest ionization energy for $Mn$

Besides $Zn$ and $Cu$, german silver contains the metal