Lanthanoid Contraction and its Consequences

Which of the following represents the incorrect order of property mentioned?

Which of the two have an almost similar size?

Lanthanide contraction is caused due to:

In $\mathrm{d}$-Block when atomic size of one series are compared with those of corresponding element in other series :-
(I) Increase from the first $\left(3\mathrm{d}\right)$ to second $\left(4\mathrm{d}\right)$ series
(II) Increase from the second $\left(4\mathrm{d}\right)$ to third $\left(5\mathrm{d}\right)$ series
(III) Virtually the same as first $\left(3\mathrm{d}\right)$ and in second $\left(4\mathrm{d}\right)$ series
(IV) Virtually the same as second $\left(4\mathrm{d}\right)$ and in third $\left(5\mathrm{d}\right)$ series

The pair that has similar atomic radii is:

Anti-penultimate electronic configuration of a trivalent lanthanide ion is 4f³ and has similar colour in aqueous solution as another trivalent lanthanide ion having anti-penultimate electronic configuration of

What is the radius of $\mathrm{Hf} (\mathrm{Z}=72)$, if the radius of $\mathrm{Zr} (\mathrm{Z}=40)$ is $160 \mathrm{pm}$?

Lanthanoid contraction is due to:

The consequence of lanthanide contraction is

Due to lanthanoid contraction

The size of Hafnium is almost similar to that of zirconium this is due to

Separation of lanthanides from their mixture is not easy because of

A reduction in atomic size with increase in atomic number is a characteristic of elements of:

The first lanthanoid is

The lanthanoid contraction is responsible for the fact that :

The trivalent ion having largest size in lanthanoid series is

Which one of the following pairs of elements is called 'chemical twins' because of their very similar chemical properties?

Identify the incorrect statement among the following.

Lanthanide contraction is caused due to