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NEET Sample Paper NEET Sample Test Paper-68

  • question_answer
    Which of the following should be done in order to prepare 0.40 M \[NaCl\] starting with 100 ml of 0.30 M NaCl \[\left( mol.wt. of\,\,NaCl = 38.5 \right)\]?

    A) Add 0.585 g NaCl

    B) Add 20 ml water

    C) Add 0.001 ml NaCl

    D) Evaporate 10 ml water

    Correct Answer: A

    Solution :

    100 ml of \[0.30\,M\,\,=\,\,\frac{100\times 0.3}{1000}\,=\,0.03\] mole of NaCl 100 ml of \[0.40\,M\,\,=\,\,\frac{100\times 0.4}{1000}\,\,=\,\,0.04\] mole of NaCl Moles of NaCl to be added \[= 0.04 - 0.03 = 0.01\] \[mole = 0.585 g\]


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