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JEE Main & Advanced Chemistry Some Basic Concepts of Chemistry / रसायन की कुछ मूलभूत अवधारणाएँ Question Bank Critical Thinking

  • question_answer
    What volume of Hydrogen gas, at 273 K and 1 atm pressure will be consumed in obtaining 21.6 g of elemental boron (atomic mass = 10.8) from the reduction of boron trichloride by Hydrogen                                               [AIEEE 2003]

    A)                 22.4 L    

    B)                 89.6 L

    C)                 67.2 L    

    D)                 44.8 L

    Correct Answer: C

    Solution :

               \[BC{{l}_{3}}+3[H]\to B+3HCl\]                    \[BC{{l}_{3}}+\frac{3}{2}{{H}_{2}}\to B+3HCl\]; \[B=\frac{21.6}{10.8}=2\]mole                    \[B\equiv \frac{3}{2}{{H}_{2}}\]                    1mole \[\equiv \frac{3}{2}\]mole ; 2 mole ? 3 mole                                 \[V=3\times 22.4=67.2L\].


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