NEET Sample Paper NEET Sample Test Paper-1

  • question_answer 54) The increasing thermal stability of the hydrides of group 16 follows the sequence

    A)  \[{{H}_{2}}O,\,{{H}_{2}}S,\,{{H}_{2}}Se,\,{{H}_{2}}Te\]

    B)  \[{{H}_{2}}Te,{{H}_{2}}Se,\,{{H}_{2}}S,\,{{H}_{2}}O\]

    C)  \[{{H}_{2}}S,{{H}_{2}}O,{{H}_{2}}Se,\,\,{{H}_{2}}Te\]

    D)  \[{{H}_{2}}Se,\,{{H}_{2}}S,{{H}_{2}}O,\,{{H}_{2}}Te\]

    Correct Answer: B

    Solution :

    As the size of the central atom M in \[{{H}_{2}}M\] increases from O to \[Te,\]the H-M bond becomes weaker and breaks easily on heating. Hence, \[{{H}_{2}}O\] is most stable and \[{{H}_{2}}Te\]is least stable.

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