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JEE Main & Advanced Chemistry Some Basic Concepts of Chemistry / रसायन की कुछ मूलभूत अवधारणाएँ Question Bank Self Evaluation Test - Some Basic Concepts of Chemistry

  • question_answer
    250 mL of a sodium carbonate solution contains 2.65 g of \[N{{a}_{2}}C{{O}_{3}}.\] If 10 mL of this solution is diluted to one litre, what is the concentration of the resultant solution? (mol. wt. of\[N{{a}_{2}}C{{O}_{3}}=106\])

    A) 0.1 M               

    B) 0.01 M

    C) 0.001 M    

    D) \[{{10}^{-4}}M\]

    Correct Answer: C

    Solution :

    [c] Molarity \[\frac{Wt\times 1000}{MW\times V\text{ }}=\frac{2.65\times 1000}{106\times 250}=0.1M\] \[{{M}_{1}}{{V}_{1}}={{M}_{2}}{{V}_{2}}\] \[\therefore 10\times 0.1=1000\times {{M}_{2}}=0.001M\]           


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