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JEE Main & Advanced Chemistry Equilibrium / साम्यावस्था Question Bank Critical Thinking

  • question_answer
    Calculate the \[{{H}^{+}}\] ion concentration in a \[1.00\,\,(M)\] \[\,HCN\,\]litre solution \[({{K}_{a}}=4\times {{10}^{-10}})\]   [Bihar CEE 1995]

    A)                 \[4\times {{10}^{-14}}\,mole/litre\]

    B)                 \[2\times {{10}^{-5}}\,mole/litre\]

    C)                 \[2.5\times {{10}^{-5}}\,mole/litre\]

    D)                 None of these

    Correct Answer: B

    Solution :

               \[[{{H}^{+}}]=\sqrt{K\times C}\]                                 \[[{{H}^{+}}]=\sqrt{4\times {{10}^{-10}}\times 1}\] ; \[[{{H}^{+}}]=2\times {{10}^{-5}}\] mole/litre


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