Which of the following ions is paramagnetic
$C{u^ + }$
$Z{n^{ + 2}}$
$T{i^{ + 3}}$
$T{i^{ + 4}}$
In making gun-berrel, the steel used is
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 $\mathrm{Sc}: 21, \mathrm{Ti}: 22, \mathrm{~V}: 23, \mathrm{Cr}$ : $24, \mathrm{Mn}: 25, \mathrm{Fe}: 26)$
Most stable compound among the following is
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.
Which of the following is wrongly matched