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

  • question_answer
    The number of moles of oxygen in one litre of air containing 21% oxygen by volume, under standard conditions are

    A) 0.0093 mole   

    B) 0.21 mole

    C) 2.10 mole         

    D) 0.186 mole

    Correct Answer: A

    Solution :

    [a] 21% of 1 litre is 0.21 litre. 22.4 litres = 1 mole at STP \[\therefore 0.21\]litre \[=\frac{0.21}{22.4}=0.0093\] mol


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