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

  • question_answer
    X and Y are two elements which form \[{{X}_{2}}{{Y}_{3}}\] and \[{{X}_{3}}{{Y}_{4}}\]. If 0.20 mol of \[{{X}_{2}}{{Y}_{3}}\] weighs 32.0 g and 0.4 mol of \[{{X}_{3}}{{Y}_{4}}\] weighs 92.8 g, the atomic weights of \[X\] and\[Y\] Fare respectively

    A) 16.0 and 56.0   

    B) 8.0 and 28.0

    C) 56.0 and 16.0

    D) 28.0 and 8.0

    Correct Answer: C

    Solution :

    Let atomic wt. of \[X=xgmo{{l}^{-1}}\] Atomic wt. of \[Y=ygmo{{l}^{-1}}\] \[\frac{32}{2x+3y}=0.2;\]                     \[\frac{92.8}{3x+4y}=0.4\] Hence X=56 and Y=16.


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