NEET Sample Paper NEET Sample Test Paper-50

  • question_answer The dissolution of \[Al{{\left( OH \right)}_{3}}\] by a solution of NaOH results in the formation of:

    A) \[{{\left[ Al{{\left( {{H}_{2}}O \right)}_{4}}{{\left( OH \right)}_{2}} \right]}^{+}}\]

    B) \[\left[ Al{{\left( {{H}_{2}}O \right)}_{3}}{{\left( OH \right)}_{3}} \right]\]

    C) \[{{\left[ Al{{\left( {{H}_{2}}O \right)}_{2}}{{\left( OH \right)}_{4}} \right]}^{-}}\]

    D) \[\left[ Al{{\left( {{H}_{2}}O \right)}_{6}}{{\left( OH \right)}_{3}} \right]\]

    Correct Answer: C

    Solution :

    \[Al{{\left( OH \right)}_{3}}\] dissolve in NaOH solution to give \[Al\left( OH \right)_{4}^{-}\] ion which is supposed to have the octahedral complex species \[{{\left[ Al{{\left( OH \right)}_{4}}{{\left( {{H}_{2}}O \right)}_{2}} \right]}^{-}}\] in aqueous solution \[Al{{(OH)}_{3}}\,+\,NaOH(aq)\,\,\to \,{{[\underset{(aq)}{\mathop{Al}}\,{{(OH)}_{4}}{{({{H}_{2}}O)}_{2}}]}^{-}}\,+\,N{{a}^{+}}\,{{\,}_{(aq)}}\]


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