The configuration that shows the outer transition element among the following is:

1. [Rn]7s²

2. [Xe]4f⁷5d¹6s²

3. [Xe]5d¹6s²

4. [Rn]5f⁷6d¹7s²

The three lanthanides that show a +2 oxidation state are:

1. Sm, Tb, Gd

2. Sm, Eu, Yb

3. La, Gd, Lu

4. Yb, Pm, Sm

When copper is heated with conc. ${\mathrm{HNO}}_3$ it produces:

1. Cu(NO₃)₂, and NO₂

2. $\mathrm{Cu}{\left({\mathrm{NO}}_3\right)}_{\mathrm{2,}}<mspace\; width="1em"></mspace>\mathrm{and}$ NO

3. Cu(NO₃)₂ , NO, and NO₂

4. Cu(NO₃)₂, and N₂ O

The acidified \(\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7\) solution turns green when \(\mathrm{Na}_2 \mathrm{SO}_3\) is added to it. This is due to the formation of:

The incorrect statement among the following is:  

When neutral or faintly alkaline ${\mathrm{KMnO}}_4$ is treated with potassium iodide, the iodide ion is converted into 'X'. The formula of 'X' is:

1. ${\mathrm{I}}_2$

2. ${\mathrm{IO}}_4^{-}$

3. ${\mathrm{IO}}_3^{-}$

4. ${\mathrm{IO}}^{-}$

Iron does not get oxidised in:

Which of the following pairs of substances on reaction will not evolve gas?

1. Iron, and ${\mathrm{H}}_2{\mathrm{SO}}_4$ (aq)

2. Iron, and steam

3. Copper, and HCl(g)

4. Sodium, and ethyl alcohol

Which of the following has the highest negative $\left(\raisebox{1ex}{${\mathrm{M}}^{2+}$}\!\left/ \!\raisebox{-1ex}{$\mathrm{M}$}\right.\right)$ standard electrode potential ?

1. Ti

2. Cu

3. Mn

4. Zn

The magnetic moment of an Mn²⁺ ion is equal to: