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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
    Silver oxide \[(A{{g}_{2}}O)\] decomposes at temperature \[300{}^\circ C\] yielding metallic silver and oxygen gas.  A 1.60 g sample of impure silver oxide yields 0.104 g of oxygen gas. What is the per cent by mass of the silver oxide in the sample?

    A) 5.9                   

    B) 47.125

    C) 94.25   

    D) 88.2

    Correct Answer: C

    Solution :

    [c] Let mass of \[A{{g}_{2}}O=xg\]  \[\begin{matrix}    A{{g}_{2}}O & \xrightarrow{{}} & 2Ag & +\,\,\,\,\,\,\frac{1}{2}{{O}_{2}}  \\    \overset{xg}{\mathop{232g}}\, & {} & {} & \frac{1}{2}\times 32=16g\,{{O}_{2}}  \\ \end{matrix}\] \[\frac{16}{232}\times x=0.104\Rightarrow x=1.508g\]  % of \[A{{g}_{2}}O=\frac{1.508}{1.6}\times 100=94.25\]%    


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