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JEE Main & Advanced Chemistry Equilibrium / साम्यावस्था Question Bank Hydrogenion concentration pH scale and buffer solution

  • 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 \[{{\max }^{m}}\].        


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