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NEET Chemistry NEET PYQ-Alkali Metals

  • question_answer
    The alkali metals form salt-like hydrides by the direct synthesis at elevated temperature. The thermal stability of these hydrides decreases in which of the following orders?  [AIPMT (S) 2008]

    A) \[CsH>RbH>KH>NaH>UH\]

    B) \[KH>NaH>LiH>CsH>RbH\]

    C) \[NaH>LiH>KH>RbH>CsH\]

    D) \[LiH>NaH>KH>RbH>CsH\]

    Correct Answer: D

    Solution :

    [d] Key Idea: Small anion forms stable compounds with small cation. The thermal stability of alkali metal hydrides decreases as: because the size of cation increases as:


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