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The s-Block Elements

Long Answer Type

101.

Lithium is the strongest reducing agent in aqueous solution. Explain.

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Short Answer Type

102.

Why do alkali metals form ionic compounds?

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103.

why is melting point of lithium higher than sodium ?

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104.

Why the melting point of sodium is lesser than that of lithium?

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105.

Why ionic conductance of alkali metal ions in aqueous solution are in the order:
Li⁺ < Mg + < K⁺ < Rb⁺ < Cs⁺ Explain ?

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106.

Why are lithium salts commonly hydrated and those of the other alkali metal ions usually anhydrous?

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107.
Comment on each of the following observations:
The mobilities of the alkali metal ions in aqueous solution are Li⁺ < Na⁺ < K⁺ < Rb⁺< Cs⁺

We know that smaller the size of the ion, more highly it is hydrated and thus greater is the mass of the hydrated ion and hence smaller is the ionic mobility. Since the extent of hydration of the ion decreases in the order
Li⁺ > Na⁺ > K⁺ > Rb⁺ > Cs⁺therefore, ionic mobility increases in the order Li⁺ < Na⁺ < K⁺ < Rb⁺ < Cs^+.

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