The sequence of ionic mobility in an aqueous solution is: 

1.  K⁺ > Na⁺ > Rb⁺ > Cs⁺

2.  Cs⁺ > Rb⁺ > K⁺ > Na⁺

3.  Rb⁺ > K⁺ > Cs⁺ > Na⁺

4.  Na⁺ > K⁺ > Rb⁺ > Cs⁺

 An amphoteric hydroxide among the following is : 

1.  $\mathrm{Be}{\left(\mathrm{OH}\right)}_2$

2.  $\mathrm{Sr}{\left(\mathrm{OH}\right)}_2$

3.  $\mathrm{Ca}{\left(\mathrm{OH}\right)}_2$

4.  $\mathrm{Mg}{\left(\mathrm{OH}\right)}_2$

The correct order of increasing thermal stability of K₂CO₃, MgCO₃, CaCO₃ and BeCO₃ is :

1. ${\mathrm{BeCO}}_3<{\mathrm{MgCO}}_3<{\mathrm{K}}_2{\mathrm{CO}}_3<{\mathrm{CaCO}}_3$

2. ${\mathrm{BeCO}}_3<{\mathrm{MgCO}}_3<{\mathrm{CaCO}}_3<{\mathrm{K}}_2{\mathrm{CO}}_3$

3. ${\mathrm{MgCO}}_3<{\mathrm{BeCO}}_3<{\mathrm{CaCO}}_3<{\mathrm{K}}_2{\mathrm{CO}}_3$

4. ${\mathrm{K}}_2{\mathrm{CO}}_3<{\mathrm{MgCO}}_3<{\mathrm{CaCO}}_3<{\mathrm{BeCO}}_3$

HCl was passed through a solution of CaCl₂, MgCl₂, and NaCl. Compound(s) that get crystallize is/are-

1. Only NaCl

2. Only MgCl₂

3. NaCl, MgCl₂, and CaCl₂

4. Both MgCl₂ and CaCl₂

The incorrect statement among the following is -

1. Li⁺ has minimum degree of hydration among alkali metal cations.

2. The oxidation state of K in KO₂ is +1

3. Sodium is used to make Na / Pb alloy.

4. MgSO₄ is readily soluble in water.

The incorrect statement among the following is- 

1. Sodium metal is used in organic qualitative analysis.

2. Sodium carbonate is soluble in water and it is used in inorganic qualitative analysis.

3. Potassium carbonate can be prepared by the solvay process.

4. Aq. solution of potassium bicarbonate is a weak base.

Lithium shows a diagonal relationship with : 

1. Sodium

2. Magnesium

3. Calcium

4. Aluminium

In case of alkali metal halides, the ionic character increases in the order : 

1. MF < MCl < MBr < MI

2. MI < MBr < MCl < MF

3. MI < MBr < MF < MCl

4. None of the above.

A molecule among the following that has the highest hydration energy is -

1. MgCl₂

2. CaCl₂

3. BaCl₂

4. SrCl₂

Among the following the least thermally stable carbonate is : 

$1.$ ${\mathrm{K}}_2{\mathrm{CO}}_3$

2. ${\mathrm{Na}}_2{\mathrm{CO}}_3$

3. ${\mathrm{BaCO}}_3$

4. ${\mathrm{Li}}_2{\mathrm{CO}}_3$