Long Answer Type
Short Answer Typewhy is melting point of lithium higher than sodium ?
It is because they have a strong tendency to lose the valence s-electron to acquire the nearest inert gas configuration. Lithium, however, because of it high ionisation enthalpy forms covalent compounds i.e. alkyl lithium (R – Li), aryl lithium (Ar – Li) etc.
Down the group new shell added which cause shielding effect and thus cause lower the melting point.
Why ionic conductance of alkali metal ions in aqueous solution are in the order:
Li+ < Mg + < K+ < Rb+ < Cs+ Explain ?
Why are lithium salts commonly hydrated and those of the other alkali metal ions usually anhydrous?
Comment on each of the following observations:
The mobilities of the alkali metal ions in aqueous solution are Li+ < Na+ < K+ < Rb+ < Cs+
Comment on each of the following observations:
Lithium is the only alkali metal which forms nitride directly.
Long Answer TypeLithium forms normal oxide, sodium forms peroxides while K, Rb and Cs form superoxides. Explain.
Short Answer Type
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