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  5. Some Basic Concepts of Chemistry / रसायन की कुछ मूलभूत अवधारणाएँ

JEE Main & Advanced Chemistry Some Basic Concepts of Chemistry / रसायन की कुछ मूलभूत अवधारणाएँ Sample Paper Topic 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 \[{{X}_{2}}{{Y}_{2}},\] weighs 32.0 g and 0.4 mol of \[{{X}_{3}}{{Y}_{4}}\] weighs 92.8 g, the atomic weights of X and Y are 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: A

    Solution :

    [a]\[\frac{32}{2x+3y}=0.2;\,\,\frac{92.8}{3x+4y}=0.4\] Hence: \[x=56\And y=16\].


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