JEE Main & Advanced Chemistry Some Basic Concepts of Chemistry / रसायन की कुछ मूलभूत अवधारणाएँ Question Bank Topic Test - Some Basic Concepts of Chemistry (8-5-21)

  • question_answer
    Vapour density of a metal chloride is 66. Its oxide contains 53% metal. The atomic weight of the metal is

    A) 21

    B) 54

    C) 27.06

    D) 2.086

    Correct Answer: C

    Solution :

    [c] Let wt. of metal oxide = 100gm
                wt. of metal = 53gm
                wt. of oxygen = 47gm
                Equivalent weight of oxygen\[=\frac{\text{wt}\text{. of metal}}{\text{wt}\text{. of oxygen}}\times 8\]   
                                                                  \[=\frac{53}{47}\times 8=9.02\]
                Valency \[=\frac{2\times V.D}{E+35.5}=\frac{2\times 66}{9+35.5}=\frac{132}{44.5}=2.96\approx 3\]
                \[\therefore \]   Atomic weight \[=\text{Equivalent weight}\times \text{Valency}\]
                                                          \[=9.02\times 3=27.06\]


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