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Correct statement among the following
I) Cs⁺ ion is more highly hydrated than other alkali metal ions
II) Among the alkali metals, only lithium forms a stable nitride by direct combination with nitrogen
III) Among the alkali metals, Li, Na, K, Rb, the metal, Rb has the highest melting point
IV) Amon alkali metals Li, Na, K, Rb only Li forms peroxide when heated with oxygen

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III

answer is B.

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Detailed Solution

Lithium only forms Nitride in alkali metals as it is diagonally related magnesium.

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