Question

Which ion amongst the following is colourless and why ? Ti4+, Cr3+, V3+ (Atomic number of Ti = 22, Cr = 24, V = 23)

Why is Mn2+ much more resistant than Fe2+ towards oxidation ?

Highest oxidation state of a metal is shown in its oxide or fluoride only. Justify the statement.

Write any two consequences of Lanthanoid Contraction.