Lithium shows a diagonal relationship with : 

1. Sodium

2. Magnesium

3. Calcium

4. Aluminium

 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 alkali metal that gives hydrated salts is - 

1. Li

2. Na

3. K

4. Cs

Alkali metals act as a : 

1. Good dehydrating agent.

2. Good reducing agent.

3. Good oxidising agent.

4. None of the above.

Alkali and alkaline earth metals cannot be obtained by chemical reduction method because they are the strongest :

1. Oxidizing agents.

2. Reducing agents.

3. Hydrating agents.

4. Drying agents.

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

1. MgCl₂

2. CaCl₂

3. BaCl₂

4. SrCl₂

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.

Be and Mg did not give flame colour because: 

1. Energy released by excited electron falls in visible region.

2. Energy released by excited electron does not fall in visible region

3. s-s transition.

4. Charge transfer.

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.

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. ${\mathrm{Li}}_2{\mathrm{CO}}_3$