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The equilibrium `Al(OH)_3+OH^(-)hArr [Al(OH)_4]^(-)` in aqueous medium shifts towards the left in the presence of :A. `NH_4Cl`B. Dilute `H_2SO_4` (not in excess)C. NaOHD. carbon dioxide gas |
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Answer» Correct Answer - A,B,D The reagent which will reduce the hydroxyl-ion concentration sufficiently cause the reaction to proceed from right to left with the consequent precipitation of `Al(OH)_3`. `[Al(OH)_4]^(-)+NH_4^(+)toAl(OH)_3darr+NH_3+H_2O` `[Al(OH)_4]^(-)+H^(+)toAl(OH)_3darr +H_2O` `2Na[Al(OH)_4]+CO_2toAl_2O_3. XH_2O(s)+2NaHCO_3` |
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