The correct order of thermal stability of carbonates of Group 2 elements is-
1.
2.
3.
4.
Assertion (A): | When an alkali metal dissolves in liquid NH3 the solution acquires different colors. |
Reason (R): | Paired electrons are present in ammonia. |
1. | (A) is true and (R) is the correct explanation of (A). |
2. | (A) is true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | Both (A) and (R) are false |
The chemical formula of Plaster of Paris is:
1.
2.
3.
4. 3CaSO4.H2O
Alkali metal with the lowest melting point is -
1. Na
2. K
3. Rb
4. Cs
The alkali metal that gives hydrated salts is -
1. Li
2. Na
3. K
4. Cs
The most stable (thermally) carbonate of alkaline earth metal is-
1. MgCO3
2. CaCO3
3. SrCO3
4. BaCO3
An alkali metals that forms only the normal oxide M2O on heating in air is-
1. Rb
2. K
3. Li
4. Na
The incorrect statement about alkali metals is -
1. They have low density.
2. They have high ionization enthalpy.
3. They are highly reactive.
4. They show photoelectric effect.
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.