The atomic radius for Li and Li+ are 12.3 Å and 0.76 Å respectively. Assuming that the difference in ionic radii relates to the space occupied by 2s electrons. What will be the % of volume of Li atom occupied by single valence electron?
70.0%
30.0%
24.75%
76.34%
In the preparation of sodium carbonate (Na2CO3), which of the following is used?
Slaked lime
Quick lime
Limestone
Sodium hydroxide
Which is the most basic of the following?
Na2O
BaO
AS2O3
Al2O3
Fires that result from the combustion of alkali metals can be extinguished by
CCl4
Sand
Water
Kerosene
Which of the following has lowest thermal stability?
Li2CO3
Na2CO3
K2CO3
Rb2CO3
Reaction given in passage is spontaneous because
NaOH formed is ionic
CaCO3 is removed from the reaction mixture
Reaction is exothermic
Reaction is endothermic
The gas evolved on heating Na2CO3 is
CO2
Water vapour
CO
No gas is evolved
Which alkali metal can be preferably used in photoelectric cell?
Li
Na
Rb
Cs
Solubility of alkaline earth metal sulphates decreases down the group 2 because
They become more ionic
Lattice energy of sulphates does not vary significantly
Hydration energy decreases rapidly from Be2+ to Ba2+
Lattice energy plays more predominant role than hydration energy
Microcosmic salt is
Na2HPO4 .2H2O
(NH4)2HPO4 . 2H2O
Na(NH4)HPO4 .4H2O
None of the above
