The incorrect statement among the following is:  

1.	There is a decrease in the radii of the atoms or ions as one proceeds from La to Lu.
2.	Lanthanoid contraction is the accumulation of successive shrinkages.
3.	As a result of lanthanoid contraction, the properties of the 4d series of the transition elements have no similarities with the 5d series of elements.
4.	The shielding power of 4f electrons is quite weak.

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:

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:

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

1. Cu(NO₃)₂, and NO₂

2. $\mathrm{Cu}{\left({\mathrm{NO}}_3\right)}_{\mathrm{2,}} \mathrm{and}$ NO

3. Cu(NO₃)₂ , NO, and NO₂

4. Cu(NO₃)₂, and N₂ O

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:

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

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

1. [Rn]7s²

2. [Xe]4f⁷5d¹6s²

3. [Xe]5d¹6s²

4. [Rn]5f⁷6d¹7s²