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9th Class Science Atoms and Molecules Question Bank Atoms and Molecules

  • question_answer
    206 g of molten sodium bromide is decomposed electrolytically. The maximum mass of sodium obtained is
    [Atomic mass of Na = 23 u, Br = 80 u]
     

    A) 40 g                

    B) 46 g    

    C) 52 g                

    D) 23 g                

    Correct Answer: B

    Solution :

    Electrolysis decomposes ionic compounds into their elements. Mass of NaBr = 23 + 80 = 103 u Now, 103 g of NaBr contains 23 g of Na \[\therefore \] 206 g of NaBr will contain \[\frac{23}{103}\times 206=46\text{ g of Na}\]


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