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JEE Main & Advanced Chemistry Analytical Chemistry Question Bank Critical Thinking Analytical

  • question_answer
    10 ml of concentrated \[HCl\] were diluted to 1 litre. 20 ml of this diluted solution required 25 ml of 0.1 N sodium hydroxide solution for complete neutralization, the normality of the concentrated hydrochloric acid will be

    A) 8.0

    B) 9.5

    C) 12.5

    D) 15.0

    Correct Answer: C

    Solution :

    \[\underset{{{N}_{1}}{{V}_{1}}\,\,\,=}{\mathop{HCl\,\,\,\,\,\,}}\,\,\,\,\underset{{{N}_{2}}{{V}_{2}}}{\mathop{NaOH}}\,\] \[{{N}_{1}}\times 20ml=0.1\times 25\] \[{{N}_{1}}=\frac{0.1\times 25}{20}=0.125\]. If one litre HCl present in 0.125 Therefore in 10 ml   \[\frac{0.125}{1000}\ \times \ 10\]  = 12.5 The normality of conc. HCl is 12.5N.


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