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

  • question_answer
    The amount of water that should be added to 500 ml of 0.5 N solution of \[NaOH\]to give a concentration of 10 mg per ml is

    A)                 100        

    B)                 200

    C)                 250        

    D)                 500

    Correct Answer: D

    Solution :

               \[{{N}_{1}}=0.5N\to 10mg\ \text{per}\ mL\]                    \[{{N}_{2}}=\frac{10\times {{10}^{-3}}gm}{40\times 1}\times 1000\]=0.25N                    \[{{V}_{1}}=500ml\],  \[{{V}_{2}}=?\]                    \[{{N}_{1}}{{V}_{1}}={{N}_{2}}{{V}_{2}}\]; \[0.5\times 500=0.25\times {{V}_{2}}\]                    \[{{V}_{2}}=1000mL\] final volume water added = 1000 ­? 500                                      = 500mL.


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