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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
    Minimum amount of \[A{{g}_{2}}C{{O}_{3}}(s)\] required to produce sufficient oxygen for the complete combustion of C, H, which produces 11.2 ltr. of \[C{{O}_{2}}\] at S.T.P after combustion is: [Ag = 108] \[A{{g}_{2}}C{{O}_{3}}(s)\to 2Ag(s)+C{{O}_{2}}(g)+1/2{{O}_{2}}(g)\]\[{{C}_{2}}{{H}_{2}}+5/2{{O}_{2}}\to 2C{{O}_{2}}+{{H}_{2}}O\]

    A) 276 g

    B) 345 g 

    C) 690 g

    D) 1380 g

    Correct Answer: B

    Solution :

    [b] \[A{{g}_{2}}C{{O}_{3}}(s)\to 2Ag(s)+C{{O}_{2}}(g)+1/2{{O}_{2}}(g)\]
    \[{{C}_{2}}{{H}_{2}}+5/2{{O}_{2}}\to 2C{{O}_{2}}+{{H}_{2}}O\]
    By Stoichiometry of reaction
    Moles of \[C{{O}_{2}}\] formed\[=\frac{11.2}{22.4}=\frac{1}{2}\]
    Moles of \[{{O}_{2}}\] required \[=\frac{5}{4}\times \frac{1}{2}=\frac{5}{8}\]
    \[\therefore \] Moles of \[A{{g}_{2}}C{{O}_{3}}\] required \[=2\times \frac{5}{8}=\frac{5}{4}\]
    Mass of \[A{{g}_{2}}C{{O}_{3}}\] required \[=\frac{5}{4}\times 276=345g\]


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