An alkali metals that forms only the normal oxide M2O on heating in air is-
1. Rb
2. K
3. Li
4. Na
The correct order of thermal stability of carbonates of Group 2 elements is-
1.
2.
3.
4.
Superoxide is formed on heating with an excess of air by:-
1. Li, Na
2. Mg, Be
3. Na, K
4. K, Rb
A blue coluored solution of an alkali metal in liq NH3 is due to the presence of -
1. atoms.
2. ions .
3. Solvated anions .
4. Solvated electrons.
Solubility of alkaline earth metal sulphates in water decreases in the sequence:
1. Mg > Ca > Sr >Ba
2. Ca > Sr > Ba > Mg
3. Sr > Ca > Mg > Ba
4. Ba > Mg > Sr > Ca
Lithium salts are generally hydrated because they have :
1. High polarizing power.
2. High ionization enthalpy.
3. High electronegativity.
4. Low polarizing power.
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
The correct order of increasing thermal stability of K2CO3, MgCO3, CaCO3 and BeCO3 is :
1.
2.
3.
4.
The correct statement(s) among the following options is/are:
1. | BeO is almost insoluble but BeSO4 is soluble in water. |
2. | BaO is soluble but BaSO4 is insoluble in water. |
3. | LiI is more soluble than KI in ethanol. |
4. | All of the above. |