Which of the following pairs of ions are colourless ?
Ti3+, Cu2+
Sc3+, Zn2+
Co2+, Fe3+
Ni2+, V3+
The element that can exhibit highest number of oxidation states amongst the following:
V
Mn
Ni
Co
A complex compound of CO3+ with molecular formula COClx. yNH3 gives a total of 3 ions when dissolved in water. How many Cl- ions satisfy both primary and secondary valencies in this complex
3
1
4
0