JEE Main & Advanced Sample Paper JEE Main Sample Paper-43

  • question_answer
    An inorganic red colored compound [A] on heating gives a compound [B] and a gas [C].[A] on treatment with cone. \[HN{{O}_{3}}\]gives compound [D]. brown colour substance [E] and neutral oxide [F]. Compound [D] on warming gives off again gas [C]. Then [E] will be

    A)  \[M{{n}_{3}}{{O}_{4}}\]              

    B)  \[Pb{{O}_{2}}\]

    C)  \[P{{b}_{3}}{{O}_{4}}\]              

    D)  \[F{{e}_{2}}{{O}_{3}}\]

    Correct Answer: B

    Solution :

     \[h{{d}_{w}}g={{h}_{w}}{{d}_{w}}g+{{h}_{o}}{{d}_{o}}g\] \[\therefore \] \[h={{h}_{w}}+\frac{{{h}_{o}}{{d}_{o}}}{{{d}_{w}}}\]    Brown  \[=100+\frac{400\times 0.9}{1}\]

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