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JEE Main & Advanced Chemistry Some Basic Concepts of Chemistry / रसायन की कुछ मूलभूत अवधारणाएँ Question Bank Critical Thinking

  • question_answer
    One litre hard water contains 12.00 mg \[M{{g}^{2+}}\]milli equivalent of washing soda required to remove its hardness is          [CBSE PMT 2001]

    A)                 1             

    B)                 12.15

    C)                 \[1\times {{10}^{-3}}\]     

    D)                 \[12.15\times {{10}^{-3}}\]

    Correct Answer: A

    Solution :

               Meq of \[M{{g}^{+2}}\equiv \]Meq of washing soda                    \[\frac{W}{E}\times 1000=\] \[M{{g}^{+2}}\]; \[EW=\frac{24}{2}=12\]                                 \[\frac{12\times {{10}^{-3}}}{12}\times 1000=1\].


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