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10th Class Science Chemical Reactions and Equations Question Bank Chemical Reactions and Equations

  • question_answer
    Observe the given figure carefully Which of the following observation(s) is/are correct?
    I. A double decomposition reaction takes place.
    II. Brown fumes of \[N{{O}_{2}}\]are evolved.
    III. Red residue is left behind in the test tube.
     

    A) I and III only    

    B) II and III only    

    C) I and II only    

    D) II only

    Correct Answer: D

    Solution :

    \[\underset{White}{\mathop{2Pb{{(N{{O}_{3}})}_{2}}}}\,\xrightarrow{\Delta }\underset{\begin{smallmatrix}  Lead\,oxide \\  (Yellow) \end{smallmatrix}}{\mathop{2PbO}}\,+\underset{(Brown\,fumes)}{\mathop{4N{{O}_{2(g)}}}}\,+{{O}_{2(g)}}\]


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