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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
    1 g mixture of equal number of mole of \[L{{i}_{2}}C{{O}_{3}}\] and other metal carbonate \[({{M}_{2}}C{{O}_{3}})\] required 21.6 mL of \[0.5\text{ }N\text{ }HCl\] for complete neutralization reaction. What is the approximate atomic mass of the other metal?        

    A) 25                    

    B) 23   

    C) 51                                

    D) 118

    Correct Answer: D

    Solution :

    [d] Let x g of \[L{{i}_{2}}C{{O}_{3}}\] and \[\left( 1-x \right)g\] of \[{{M}_{2}}C{{O}_{3}}\] present in given mixture \[2\times \]  Total moles of carbonates = moles of HCl and \[2\times \left( \frac{x}{74}+\frac{1-x}{2M+60} \right)=21.6\times 0.5\times {{10}^{-3}}\] \[x=0.20\] \[\therefore \frac{x}{74}=\frac{1-x}{2M+60}\] \[M=118\]


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