Preparation and Properties of Potassium Carbonate

Q.

Which one of the alkaline earth metal carbonates is thermally the most stable?

(a) MgCO₃ (b) CaCO₃ (c) SrCO₃ (d) BaCO₃

Q.

The correct order of increasing thermal stability of $K_{2}C{O}_3,MgC{O}_3,CaC{O}_{3}andBeC{O}_3$ is:

1. $BeC{O}_3<MgC{O}_3<CaC{O}_3<K_{2}C{O}_3$

2. $MgC{O}_3<BeC{O}_3<CaC{O}_3<K_{2}C{O}_3$

3. $K_{2}C{O}_3<MgC{O}_3<CaC{O}_3<BeC{O}_3$

4. $BeC{O}_3<MgC{O}_3<K_{2}C{O}_3<CaC{O}_3$

Q. Which of the following is the least thermally stable?

1. $MgC{O}_3$
2. $BaC{O}_3$
3. $L{i}_{2}C{O}_3$
4. $BeC{O}_3$

Q.

The correct order of increasing thermal stability of $K_{2}C{O}_3,MgC{O}_3,CaC{O}_{3}andBeC{O}_3$ is:

1. $BeC{O}_3<MgC{O}_3<CaC{O}_3<K_{2}C{O}_3$

2. $MgC{O}_3<BeC{O}_3<CaC{O}_3<K_{2}C{O}_3$

3. $K_{2}C{O}_3<MgC{O}_3<CaC{O}_3<BeC{O}_3$

4. $BeC{O}_3<MgC{O}_3<K_{2}C{O}_3<CaC{O}_3$

Q. Which of the following bonds produces a solid that reflects light in the visible region and whose electrical conductivity decreases with temperature and has high melting point?

1. Van der Waals bonding
2. Metallic bonding
3. Ionic bonding
4. Covalent bonding

Q.

The correct order of increasing thermal stability of $K_{2}C{O}_3,MgC{O}_3,CaC{O}_{3}andBeC{O}_3$ is:

1. $BeC{O}_3<MgC{O}_3<CaC{O}_3<K_{2}C{O}_3$

2. $MgC{O}_3<BeC{O}_3<CaC{O}_3<K_{2}C{O}_3$

3. $K_{2}C{O}_3<MgC{O}_3<CaC{O}_3<BeC{O}_3$

4. $BeC{O}_3<MgC{O}_3<K_{2}C{O}_3<CaC{O}_3$

Q. The following compounds have been arranged in order of their increasing thermal stabilities. Identify the correct order :
$K_{2}C{O}_3\left(I\right)MgC{O}_3\left(II\right)$
$CaC{O}_3\left(III\right)BeC{O}_3\left(lY\right)$

1. I < II < III < IV
2. IV < II < III < I
3. IV < II < I< III
4. II < IV < III < I

Q. "The lattice energies of alkaline earth metal salts are much higher than these of alkali metal salts."
Answer whether the above statement is true or false.
If true enter 1, else enter 0.

Q. Select the correct order for the given properties.

1. Thermal stability : $L{i}_{2}S{O}_4<N{a}_{2}S{O}_4<K_{2}S{O}_4$
2. Solubility : $BeC{O}_3>MgC{O}_3>CaC{O}_3$
3. Thermal stability : $BeC{O}_3<MgC{O}_3<CaC{O}_3$
4. None of the above.

Q. The alkaline earth metal that does not lose its metallic lusture when exposed to air is:

1. Ba
2. Be
3. Ca
4. Mg

Q. The correct order of stability for the following super oxides is :

1. $Rb{O}_2>Cs{O}_2>K{O}_2$
2. $Cs{O}_2>Rb{O}_2>K{O}_2$
3. $K{O}_2>Cs{O}_2>Rb{O}_2$
4. $K{O}_2>Rb{O}_2>Cs{O}_2$

Q. Entries in List 1 are to be matched with entries of List- 2. Each entry of List-1 may have matching with one or more than one entries in List-2.

Q. Which of the following are arranged in increasing order of solubilities?

1. $CaC{O}_3<KHC{O}_3<NaCH{O}_3$
2. $NaCH{O}_3<KHC{O}_3<CaC{O}_3$
3. $KHC{O}_3<NaHC{O}_3<CaC{O}_3$
4. $CaC{O}_3<NaHC{O}_3<KHC{O}_3$

Q. Discuss the trend of the following: Thermal stability of carbonates of Group 2 elements.

Q.

Why is Li₂CO₃ decomposed at a lower temperature whereas Na₂CO₃ at higher temperature?

Q.

The correct order of increasing thermal stability of $K_{2}C{O}_3,MgC{O}_3,CaC{O}_{3}andBeC{O}_3$ is:

1. $BeC{O}_3<MgC{O}_3<CaC{O}_3<K_{2}C{O}_3$

2. $MgC{O}_3<BeC{O}_3<CaC{O}_3<K_{2}C{O}_3$

3. $K_{2}C{O}_3<MgC{O}_3<CaC{O}_3<BeC{O}_3$

4. $BeC{O}_3<MgC{O}_3<K_{2}C{O}_3<CaC{O}_3$

Q.

The correct order of increasing thermal stability of $K_{2}C{O}_3,MgC{O}_3,CaC{O}_{3}andBeC{O}_3$ is:

1. $BeC{O}_3<MgC{O}_3<CaC{O}_3<K_{2}C{O}_3$

2. $MgC{O}_3<BeC{O}_3<CaC{O}_3<K_{2}C{O}_3$

3. $K_{2}C{O}_3<MgC{O}_3<CaC{O}_3<BeC{O}_3$

4. $BeC{O}_3<MgC{O}_3<K_{2}C{O}_3<CaC{O}_3$

Q.

The correct order of increasing thermal stability of $K_{2}C{O}_3,MgC{O}_3,CaC{O}_{3}andBeC{O}_3$ is:

1. $BeC{O}_3<MgC{O}_3<CaC{O}_3<K_{2}C{O}_3$

2. $MgC{O}_3<BeC{O}_3<CaC{O}_3<K_{2}C{O}_3$

3. $K_{2}C{O}_3<MgC{O}_3<CaC{O}_3<BeC{O}_3$

4. $BeC{O}_3<MgC{O}_3<K_{2}C{O}_3<CaC{O}_3$