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12th Class Chemistry The p-Block Elements-I / p-ब्लॉक के कुछ तत्व-I Question Bank MCQs - The p-Block Elements

  • question_answer
    Which is the correct thermal stability order for \[{{H}_{2}}E\](E = O, S, Se, Te and Po)?

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

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

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

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

    Correct Answer: D

    Solution :

    The thermal stability of hydrides decreases from \[{{H}_{2}}O\] to \[{{H}_{2}}Po\]. This is because as the size of atom E in \[{{H}_{2}}E\] increases, the bond H-E becomes weaker and thus breaks on heating. Therefore, the correct order of thermal stability is \[{{H}_{2}}Po<{{H}_{2}}Te<{{H}_{2}}Se<{{H}_{2}}S<{{H}_{2}}O\].


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