Here it is
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All other statements can be true except with K⁺
Colour of the ions is due to  d- d  transition ie when electrons jump from one d orbital to another then energy transition falls in visible range which imparts colour to ion.
In K⁺  we don't have any d orbitals with any electrons
K⁺ electronic configuartions is 1s²2s²2p⁶3s²3p⁶
Hence the probability of d-d transition is zero
So there will be no colour even if its not going to follow Aufbau or Hund's rule