Zadanie 8
Wzorowane na: Chemistry HL Paper 1, November 2024, pytanie 8. Treść, dane i kontekst są zmienione; sprawdzane umiejętności, format i punktacja jak w oryginale.
Darmowe konto pozwoli wrócić do niego później.
Polecenie
[Ni(H2O)6]2+ is green, whereas [Ni(NH3)6]2+ is blue.
Which statement best accounts for the different colours of the two complex ions?
A. The two sets of ligands give different energy gaps between the split 3d orbitals, so light of different frequencies is absorbed.
B. Nickel has a different oxidation state in each complex ion.
C. The colour of each complex ion is the same as the colour of the light that it absorbs.
D. Light is absorbed when an electron is promoted from a 3d orbital to a 4s orbital.
Sprawdź rozwiązanieUkryj rozwiązanieKlucz i punktacja
Odpowiedź z klucza
A ✔
«the ligands split the 3d sublevel by different amounts, so an electron is promoted by light of a different frequency in each ion; the colour seen is complementary to the colour absorbed (C is false), nickel is +2 in both ions (B is false) and the promotion is between the split 3d orbitals (D is false)»
Schemat punktowania
One mark for the correct option.