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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