Answer:            Iron has 5 unpaired electrons in Fe⁺³ state.Explanation:Iron having atomic number 26 has following electronic configuration in neutral state.                             Fe =  1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d⁶When Iron looses three electrons it attains +3 charge with following electronic configuration.                             Fe⁺³ =  1s², 2s², 2p⁶, 3s², 3p⁶, 3d⁵The five electrons in d-orbital exist in unpaired form as,                          3(dz)¹, 3d(xz)¹, 3d(yz)¹, 3d(xy)¹, 3(dx²-y²)¹