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NEET Sample Paper NEET Sample Test Paper-25

  • 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)  KH > NaH > LiH > CsH > RbH

    B)  NaH > LiH > KH > RbH > CsH

    C)  LiH > NaH > KH > RbH > CsH

    D)  CsH > RbH > KH > NaH > LiH

    Correct Answer: C

    Solution :

     The tendency to form their hydrides, basic character and stability decreases from Li to Cs since the electropositive character decreases from Cs to Li.


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