Question

What is Lanthanoid contraction ? What is the cause of Lanthanoid contraction ? Write two consequences of Lanthanoid contraction.

Answer the following questions on the basis of the figure given below :

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 ?