JEE Main & Advanced Chemistry The s-Block Elements Question Bank Critical Thinking

  • question_answer Concentrated aqueous sodium hydroxide can separate mixture of [MNR 1995]

    A) \[A{{l}^{3+}}\] and \[S{{n}^{2+}}\]

    B) \[A{{l}^{3+}}\] and \[F{{e}^{3+}}\]

    C) \[A{{l}^{3+}}\] and \[Z{{n}^{2+}}\]

    D) \[Z{{n}^{2+}}\] and \[P{{b}^{2+}}\]

    Correct Answer: B

    Solution :

    \[NaOH+A{{l}^{+3}}\,\to \,\underset{(\text{Soluble}\,\text{in}\,NaOH)}{\mathop{\underset{\text{Sod}\text{. metaaluminate}}{\mathop{NaAl{{O}_{2}}}}\,}}\,\] \[NaOH+F{{e}^{+3}}\,\to \]No reaction (Insoluble in NaOH)

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