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JEE Main & Advanced Sample Paper JEE Main Sample Paper-13

  • question_answer
    A 0.1 M solution of a certain cation will form a precipitate with 0.1 M solution of all these anions \[O{{H}^{\odot -}},\]\[CO_{3}^{2-},\,C{{l}^{-}},\,SO_{4}^{2-}\]. Which cation fits in this description?

    A)  \[B{{a}^{2+}}\]                

    B)  \[F{{e}^{2+}}\]

    C)  \[M{{g}^{2+}}\]                              

    D)  \[P{{b}^{2+}}\]

    Correct Answer: D

    Solution :

     \[{{q}_{1}}\,:\,\,{{q}_{2}}=1:\,9,\,\,L=1\,m\] \[x\] \[\therefore \] \[\frac{1}{4\pi {{\varepsilon }_{0}}}\frac{1}{{{x}^{2}}}=\frac{1}{4\pi {{\varepsilon }_{0}}}\,\frac{9}{{{(1-x)}^{2}}}\]


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