s-Block ElementsHard
Question
Select the correct statement.
Options
A.Among the alkali metals, only lithium reacts with nitrogen directly to form nitride.
B.Among the alkali metal carbonates, Li2CO3 has the lowest thermal stability.
C.Among the alkali metal hydroxide, CsOH has the highest solubility in water.
D.All of these.
Solution
(A) Lithium show exceptional behavior in reaction directly with nitrogen of air to form the nitride, Li3N.
(B) Smaller cation (Li+) polarises bigger anion (CO32-) liberating CO2 gas. So it has the lowest thermal stability.
(C) The solubility of the alkali metal hydroxides increases down the group from Li to Cs. This is because of the fact that down the group with increasing size of cation, the lattice energy as well as hydration energy also decreases but the change in lattice energy is more as compare to that of hydration energy.
(B) Smaller cation (Li+) polarises bigger anion (CO32-) liberating CO2 gas. So it has the lowest thermal stability.
(C) The solubility of the alkali metal hydroxides increases down the group from Li to Cs. This is because of the fact that down the group with increasing size of cation, the lattice energy as well as hydration energy also decreases but the change in lattice energy is more as compare to that of hydration energy.
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