The color exhibited by one of the iron ions in aqueous solutions is pale green. The primary valency and secondary valency respectively in the green complex are

As per the question, the presence of a pale component can be attributed to [Fe(H₂O)₄]²⁺, thus primary valency can be calculated as x where : x + (4$\times$0) = 2, x = 2. 
The number of ligands would denote the secondary valency, therefore 4.