JEE Main & Advanced Chemistry The s-Block Elements Question Bank Critical Thinking

  • question_answer The atomic radii of alkali metals (M) lie in the order \[Li<Na<K<Rb\] but the radii of \[{{M}^{+}}\] ions in aqueous solution lie in the reverse order \[L{{i}^{+}}>N{{a}^{+}}>{{K}^{+}}>R{{b}^{+}}\]. What is the reason for this reverse order (on going from \[Li\] to\[Rb)\]? [MP PMT 1997]

    A) Gradual increase in ionisation energy

    B) Increasing weakness of the metallic bond

    C) Increasing electropositive character

    D) Decreasing degree of hydration

    Correct Answer: D

    Solution :

    Smaller the atomic size tendency of hydration is more as the size increases tendency for hydration also decreases.

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