The most stable (thermally) carbonate of alkaline earth metal is-

1. MgCO₃

2. CaCO₃

3. SrCO₃

4. BaCO₃

The characteristic of alkaline earth metals is that-

1. Their general oxidation state is +1

2. They have a smaller size than alkali metals.

3. They are electronegative in nature.

4. They are strong oxidizing agents.

Sodium is less reactive than potassium because-

1. Potassium loses electron easily.

2. Sodium loses electron easily.

3. Size of sodium is larger than potassium.

4. Nuclear charge is more on potassium.

The correct diagonal relation of  Li and Mg among the following is -

1. Both form solid bicarbonates.

2. Their oxides are less soluble in water.

3.Their carbonates are ionic in nature.

4. Both form peroxides and superoxides.

The correct statement(s) about the structure of BeCl₂ is -
a. BeCl₂ (solid)- exists as polymer.
b. BeCl₂ (vapour)- exists as chlorobridged dimer.
c. BeCl2 has bent structure in the vapour phase.
1. a
2. a & b
3. b
4. b & c

Alkali metals are not found in nature in their elemental state because they are : 

1. Less reactive due to low ionization energies.

2. Highly reactive due to low ionization energies.

3. Highly reactive due to low electron gain enthalpy.

4. Less reactive due to low electron gain enthalpy.

The oxidation state of sodium in Na₂O₂ is -

1. +1

2. -1

3. 0

4. +2

Lithium salts are generally hydrated because they have :

1. High polarizing power.

2. High ionization enthalpy.

3. High electronegativity.

4. Low polarizing power.

LiF is almost insoluble in water whereas LiCl is soluble in water and acetone both, because of:

The incorrect reaction among the following is: