Which of the following pairs of ions are colourless ?
A. Ti3+, Cu2+
B. Sc3+, Zn2+
C. Co2+, Fe3+
D. Ni2+, V3+
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
The element that can exhibit highest number of oxidation states amongst the following: