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

  • question_answer
    If \[1\frac{1}{2}\]moles of oxygen combine with Al to form \[A{{l}_{2}}{{O}_{3}}\]the weight of Al used in the reaction is (Al=27)              [EAMCET 1980]

    A)                 27 g       

    B)                 54 g

    C)                 49.5 g    

    D)                 31 g

    Correct Answer: B

    Solution :

               \[2Al+\frac{3}{2}{{O}_{2}}\to A{{l}_{2}}{{O}_{3}}\]                    According to equation \[\frac{3}{2}\] mole of \[{{O}_{2}}\] combines with 2 mole Al.                                 2 mole Al = 54gm


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