The correct statement regarding inner transition elements is:

1.	The general electronic configuration of actinoids is ${\left[\mathrm{Xe}\right]}^{54}$ $4{\mathrm{f}}^{1-14}5{\mathrm{d}}^{0-1}6{\mathrm{s}}^2$
2.	The general electronic configuration of lanthanoids is ${\left[\mathrm{Rn}\right]}^{86}$ $5{\mathrm{f}}^{1-14}6{\mathrm{d}}^{0-1}7{\mathrm{s}}^2$
3.	Alkalies have no action on actinoids.
4.	The principal oxidation state of lanthanoids is +1.

$\left(\mathrm{i}\right)<mspace\; width="1em"></mspace>{\mathrm{FeCr}}_2{\mathrm{O}}_4<mspace\; width="1em"></mspace>\hspace{0.17em}+<mspace\; width="1em"></mspace>\mathrm{NaOH}<mspace\; width="1em"></mspace>+<mspace\; width="1em"></mspace>{\mathrm{O}}_2<mspace\; width="1em"></mspace>\underset{}{\to }<mspace\; width="1em"></mspace>...<mspace\; width="1em"></mspace>\mathrm{X}.....+<mspace\; width="1em"></mspace>{\mathrm{Fe}}_2{\mathrm{O}}_3<mspace\; width="1em"></mspace>+\hspace{0.17em}{\mathrm{H}}_2\mathrm{O}$
$\left(\mathrm{ii}\right)<mspace\; width="1em"></mspace>{\mathrm{K}}_2{\mathrm{MnO}}_4<mspace\; width="1em"></mspace>+\hspace{0.17em}{\mathrm{O}}_3<mspace\; width="1em"></mspace>+<mspace\; width="1em"></mspace>{\mathrm{H}}_2\mathrm{O}<mspace\; width="1em"></mspace>\stackrel{}{\to }<mspace\; width="1em"></mspace><mspace\; width="1em"></mspace>.....\mathrm{Y}....<mspace\; width="1em"></mspace>+<mspace\; width="1em"></mspace>\mathrm{KOH}<mspace\; width="1em"></mspace>+<mspace\; width="1em"></mspace>{\mathrm{O}}_2$

The products X and Y in the above reactions (i) and (ii) are respectively:

$1.<mspace\; width="1em"></mspace>{\mathrm{Na}}_2{\mathrm{Cr}}_2{\mathrm{O}}_{7<mspace\; width="1em"></mspace>},<mspace\; width="1em"></mspace>{\mathrm{K}}_2{\mathrm{MnO}}_8$
$2.<mspace\; width="1em"></mspace>{\mathrm{Na}}_2{\mathrm{CrO}}_4,<mspace\; width="1em"></mspace>{\mathrm{KMnO}}_4$
$3.<mspace\; width="1em"></mspace>{\mathrm{Na}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7,<mspace\; width="1em"></mspace>{\mathrm{KMnO}}_4$
$4.<mspace\; width="1em"></mspace>{\mathrm{NaCrO}}_4,<mspace\; width="1em"></mspace>{\mathrm{MnO}}_2$

The correct statement(s) about transition elements is/are:  

Which of the following correctly explains the positive $\mathrm{E}°({\mathrm{M}}^{2+}/\mathrm{M})$ value for copper (+0.34 V)?

The correct trend for I.E₁ (1st Ionization Enthalpy) in the 3d series is: 

The correct statement(s) regarding the oxidation state of transition elements is/are:
1. The oxidation state can vary from +1 to +7
2. Variable oxidation states are possible.
3. Both (1) and (2) 
4. None of the above

The reaction(s) involved in the preparation of potassium dichromate from iron chromite ore is/are:

For M²⁺/M, and M³⁺/M²⁺, the $\mathrm{E}°$ values of some metals are given in the table below:

The correct inference(s) from the above data is/are: