Short Answer TypeThe ionic radii of alkali metal ions in aqueous solution follows the order Li+ > Na+> K+ > Rb+ > Cs+ Justify the above order.
Long Answer TypeDiscuss the general trends in ionisation enthalpy and electropositive character of alkali metals.
Short Answer TypeLithium ion has the lowest and caesium ion has the highest mobility in an electric field. Explain.
When an alkali metal dissolves in liquid ammonia the solution can acquire different colours. Explain the reactions for this type of colour change.
Or
Explain why alkali metals dissolve in liquid ammonia to form deep blue solution.
Explain why alkali metals are electrically conducting and form soluble salts ?
Alkali metals have metallic bonds in which the positive ions are held together by electrons. The valence electrons move freely from one metal ion to another without much difficulty and thus have high electrical conductivity. Solubility depends on lattice enthalpy and hydration enthalpy. Since the alkali metal ions have low lattice enthalpy and high hydration energy so they form soluble salts.
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