Colour of ions

Which of the following best describes the colour of  $Cu^{2+}$  in aqueous solution?

• blue

• reddish brown

• silvery

• colourless

Which of the following best describes the colour of  $Fe^{2+}$ in aqueous solution?

• green

• pale green

• dark green

• yellow

Which of the following best describes the colour of  $Fe^{3+}$  in aqueous solution?

• pale green

• yellow

• silvery

• colourless

Which of the following best describes the colour of  $Co^{2+}$  in aqueous solution?

• pink

• red

• green

• blue

The colour of $MnO_4^-$ is 

• colourless.

• very pale pink.

• red.

• purple.

The colour of  $Cr_2O_7^{2-}$  is

• red.

• yellow.

• orange.

• brown.

Which of the following ions is NOT yellow? (You may select more than 1 answer.)

• Ca²⁺

• CrO₄^2-

• Cr³⁺

• MnO₄^-

• Fe³⁺

Select TWO from the following ions that could NOT be green.

• Cr³⁺

• Na⁺

• Ni²⁺

• Cu²⁺

• Cl^-

Which TWO of the following can be used to describe the colour of  $Mn^{2+}$  in aqueous solution?

• colourless

• very pale pink

• pink

• purple

Which of the following solution is coloured? (You may select more than 1 answer.)

• copper(II) nitrate

• sodium hydroxide

• potassium dichromate

• zinc chloride

• potassium permanganate