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JEE Main & Advanced Chemistry Solutions / विलयन Sample Paper Topic Test - Solutions

  • question_answer
    Concentrated \[HN{{O}_{3}}\] is 63% \[HN{{O}_{3}}\] by mass and has a density of 1.4 g/mL. How many millilitres of this solution are required to prepare 250 mL of a 1.20 M \[HN{{O}_{3}}\] solution?

    A) 18.0

    B) 21.42            

    C) 20.0

    D) 14.21

    Correct Answer: B

    Solution :

    [b] m-moles of \[HN{{O}_{3}}\] required
              \[=250\times 1.2=300\]
    100 g solution contain 1 mole \[HN{{O}_{3}}\]
     \[\frac{100}{1.4}mL\] solution contain 1 mole \[HN{{O}_{3}}\]
    \[C{{O}_{2}}\] molarity of \[HN{{O}_{3}}\] solution
    \[=\frac{1000}{100}\times 1.40=14\]
    \[\therefore \] \[14\times V=300\] or \[V=21.42\,mL\]


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