Zadanie 14
Wzorowane na: Chemistry HL Paper 1A, May 2026, TZ3, pytanie 14. Treść, dane i kontekst są zmienione; sprawdzane umiejętności, format i punktacja jak w oryginale.
Darmowe konto pozwoli wrócić do niego później.
Polecenie
The complex ion [Zn(H2O)6]2+ is colourless, but the complex ion [Cu(H2O)6]2+ is blue.
Which option gives a correct reason for the zinc complex and the electron configuration of the copper(II) ion?
A. Light is absorbed when an electron is promoted between split d orbitals; Cu2+ is [Ar] 3d9
B. All the d orbitals are full, so an electron cannot be promoted between split d orbitals; Cu2+ is [Ar] 4s2 3d7
C. All the d orbitals are full, so an electron cannot be promoted between split d orbitals; Cu2+ is [Ar] 3d9
D. Zinc ions have no d electrons, so no promotion is possible; Cu2+ is [Ar] 3d9
Sprawdź rozwiązanieUkryj rozwiązanieKlucz CKE i punktacja
Odpowiedź z klucza
C ✔
«Zn2+ is [Ar] 3d10: the d sublevel is full, so no electron can be promoted between the split d orbitals and no visible light is absorbed; Cu2+ is [Ar] 3d9»
Schemat punktowania
1 mark for the correct option.
Komentarz
Zinc(II) has ten d electrons, not none; copper loses its 4s electron and one 3d electron.