2. Solved Papers
  3. NEET

NEET AIPMT SOLVED PAPER SCREENING 2008

  • 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 > UH

    B) KH > NaH > LiH > CsH > RbH

    C) NaH > LiH > KH > RbH > CsH

    D) LiH > NaH > KH > RbH > CsH

    Correct Answer: D

    Solution :

    Key Idea: Small anion forms stable compounds with small cation. The thermal stability of alkali metal hydrides decreases as: \[LiH>NaH>KH>RbH>CsH\] because the size of cation increases as: \[L{{i}^{+}}<N{{a}^{+}}<{{K}^{+}}<R{{b}^{+}}<C{{s}^{+}}\]


You need to login to perform this action.
You will be redirected in 3 sec spinner