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J & K CET Engineering J and K - CET Engineering Solved Paper-2006

  • question_answer
    5 L of a solution contains\[\text{25}\,\text{mg}\] of \[\text{CaC}{{\text{O}}_{3}}.\]What is its concentration in ppm? (mol. wt. of \[\text{CaC}{{\text{O}}_{\text{3}}}\]is 100)

    A)  25           

    B)  1

    C)  5           

    D)  2500

    Correct Answer: C

    Solution :

     \[\text{PPM}\,\text{=}\frac{\text{weight}\,\text{of}\,\text{solute}\,\text{ }\!\!\times\!\!\text{ 1}{{\text{0}}^{\text{6}}}}{\text{weight}\,\text{of}\,\text{solution}}\] \[=\frac{25\times {{10}^{-3}}\times {{10}^{-6}}}{5000}=5\]


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