Reactions of ions in aqueous solution basics

Which of these would have the lowest pH?

• [Cu(H₂O)₆]²⁺

• [Fe(H₂O)₆]²⁺

• [Co(H₂O)₆]²⁺

• [Fe(H₂O)₆]³⁺

A solution of ammonia contains which ligands?

• H₃O⁺

• NH₃

• OH^-

• NH₄⁺

Adding a solution of sodium hydroxide to a solution of iron(II) compounds produces a precipitate of which colour?

• Brown

• White

• Blue

• Green

Adding a solution of sodium hydroxide to solutions of copper(II) compounds produces a precipitate of which colour?

• Brown

• White

• Blue

• Green

Adding a solution of sodium hydroxide to solutions of aluminium compounds produces a precipitate of which colour?

• Brown

• White

• Blue

• Green

Adding a solution of sodium hydroxide to solutions of iron(III) compounds produces a precipitate of which colour?

• Brown

• White

• Blue

• Green

Adding an excess of aqueous ammonia will cause which precipitate to re-dissolve?

• Cu(H₂O)₄(OH)₂

• Fe(H₂O)₃(OH)₃

• Al(H₂O)₃(OH)₃

• Fe(H₂O)₄(OH)₂

Adding an excess of aqueous sodium hydroxide will cause which precipitate to re-dissolve?

• Cu(H₂O)₄(OH)₂

• Fe(H₂O)₃(OH)₃

• Al(H₂O)₃(OH)₃

• Fe(H₂O)₄(OH)₂

After adding sodium hydroxide to a solution containing iron(II) ions, the precipitate will gradually change colour from:

• Blue to orange

• Blue to green

• Brown to green

• Green to brown

Which of the following would produce carbon dioxide gas when aqueous sodium carbonate solution was added to it?

• [Al(H₂O)₆]³⁺

• [Fe(H₂O)₆]²⁺

• [Fe(H₂O)₆]³⁺

• [Cu(H₂O)₆]²⁺