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The s-Block Elements

Short Answer Type

91.

The ionic radii of alkali metal ions in aqueous solution follows the order Li⁺ > Na⁺> K⁺ > Rb⁺ > Cs⁺Justify the above order.

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Long Answer Type

92.

Discuss the general trends in ionisation enthalpy and electropositive character of alkali metals.

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Short Answer Type

93.
Why do alkali metals impart characteristic colours to the flame?

Alkali metals impart characteristic colours to the flame due to low ionisation enthalpy, when an alkali metal or its salt is heated in a flame, the valence electrons are excited to higher energy level. When these excited electrons return to the ground state, the absorbed energy is emitted in the visible region of the electromagnetic spectrum and hence the flame appears coloured.

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94.

Why do alkali metals from unipositive ions?

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95.

Lithium ion has the lowest and caesium ion has the highest mobility in an electric field. Explain.

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96.

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.

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