JEE Main & Advanced Chemistry The s-Block Elements Question Bank Critical Thinking

  • question_answer What is the correct relationship between the pHs of isomolar solutions of sodium oxide \[(p{{H}_{1}}),\] sodium sulphide \[(p{{H}_{2}}),\] sodium selenide \[(p{{H}_{3}})\] and sodium telluride \[(p{{H}_{4}})\] [CBSE PMT 2005]

    A) \[p{{H}_{1}}>p{{H}_{2}}=p{{H}_{3}}>p{{H}_{4}}\]

    B) \[p{{H}_{1}}<p{{H}_{2}}<p{{H}_{3}}<p{{H}_{4}}\]

    C) \[p{{H}_{1}}<p{{H}_{2}}<p{{H}_{3}}=p{{H}_{4}}\]

    D) \[p{{H}_{1}}>p{{H}_{2}}>p{{H}_{3}}>p{{H}_{4}}\]

    Correct Answer: D

    Solution :

    Order of acidic strength is \[{{H}_{2}}Te>{{H}_{2}}Se>{{H}_{2}}S>{{H}_{2}}O\] \[N{{a}_{2}}O\] is a salt of \[NaOH+{{H}_{2}}O\]and \[{{H}_{2}}O\]is least acidic among given acids hence pH in this case will be maximum.

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