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Which one of the following does not give a precipitate with excess of both NaOH solution and `NH_(3)` solution ?A. `Pb(NO_(3))_(2)`B. `Zn(NO_(3))_(2)`C. `Al(NO_(3))_(2)`D. `Cu(NO_(3))_(2)` |
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Answer» Correct Answer - B `(2)Zn^(2+)+2OH^(-)rarrZn(OH)_(2) darr ("white")` `Zn(OH)_(2) darr +2 OH^(-) rarr [Zn(OH)_(2)]^(2-)` (colourless soluble complex) `Zn^(2+)+2NH_(3)+2H_(2)O rarr Zn (OH)_(2) darr ("white") +2NH_(4)^(+)` `Zn(OH)_(2) darr 4NH_(3) rarr [Zn (NH_(3))_(4)]^(2+)+2OH^(-)` |
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