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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⁺

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108.

Comment on each of the following observations:
Lithium is the only alkali metal which forms nitride directly.

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Long Answer Type

109.

Lithium forms normal oxide, sodium forms peroxides while K, Rb and Cs form superoxides. Explain.

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Short Answer Type

110.
'Strenth of the bases increases from LiOH to CsOH'. Comment

As we go down the group, the cation size increases which results in the increase of the distance between metal-oxygen bond, this, in turn, causes greater separation of the cation from the hydroxide ion. Thus, LiOH is the weakest base while CsOH is the strongest base.

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