Which pair of metal ions in their respective oxidation states forms colourless compounds?
- A$Zn^{2+}$ and $Cu^{+}$
- B$Cu^{2+}$ and $Sc^{3+}$
- C$Ti^{4+}$ and $Mn^{2+}$
- D$Mn^{3+}$ and $Ni^{2+}$
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