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JEE Main & Advanced Chemistry The s-Block Elements / s-ब्लॉक के तत्व Question Bank Self Evaluation Test - The s-Block Elements

  • 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?

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

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

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

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

    Correct Answer: D

    Solution :

    [d] The stability of alkali metal hydrides decreases from \[Li\] to \[Cs\]. It is due to the fact that \[M-H\] bonds become weaker with increase in size of alkali metals as we move down the group from \[Li\] to \[Cs\]. Thus the order of stability of hydrides is \[LiH>NaH>KH>RbH>CsH\]


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