The electronic configurations of Eu (Atomic no. 63), Gd (Atomic no. 64), and Tb (Atomic no. 65) are, respectively:
 

1. [Xe] 4f⁶ 5d¹ 6s², [Xe]4f⁷ 5d¹ 6s², and [Xe] 4f⁹ 6s²

2. [Xe] 4f⁶ 5d¹ 6s², [Xe] 4f⁷5d¹ 6s², and [Xe]4f⁸ 5d¹ 6s²

3. [Xe] 4f⁷ 6s², [Xe]4f⁷ 5d¹ 6s², and [Xe] 4f⁹ 6s²

4. [Xe] 4f⁷ 6s², (Xe]4f⁸ 6s², and [Xe]4f⁸ 5d¹ 6s²

Which of the following statements is false? 

Match the metal ions given in Column I with the spin magnetic moments of the ions given in Column II
and select  the correct match:

Zinc can be coated on iron to produce galvanised iron, but the reverse is not possible because:

A gas that can readily decolorize an acidified KMnO₄ solution is:

1. ${\mathrm{SO}}_2$

2. ${\mathrm{NO}}_2$

3. ${\mathrm{P}}_2{\mathrm{O}}_5$

4. ${\mathrm{CO}}_2$

Which compound cannot decolourise KMnO₄ solution?

1. CO₃^-2

2. NO₂^-

3. S^2-

4. Cl^-

The native silver metal forms a water-soluble complex with a dilute aqueous solution of NaCN in the presence of :

1. Nitrogen

2. Oxygen

3. Carbon dioxide

4. Argon

The incorrect statement among the following regarding Cerium is :  

The ionization potential values of d-block elements as compared to the ionization potential values of f-block elements are: