Question

Observe the following statements.
$1$. Lanthanides actively participate in chemical reactions.
$2$. The basic nature of hydroxides of lanthanides increases from $La(OH{)}_3$ to $Lu(OH{)}_3$.
$3$. Lanthanides do not form coordinate compounds as readily as d-block metals.
The correct statements are:

• A. $1,2$ & $3$
• B. $1$ & $3$
• C. $1$ & $2$
• D. $2$ & $3$

Answer 1

The correct option is B $1$ & $3$

$1$. Lanthanides actively participate in chemical reactions. Lanthanides have high negative $E^o$ values so they are good reducing agents. They rapidly react with hot water to liberate hydrogen.

$2$. The basic nature of hydroxides of lanthanides decreases from $La(OH{)}_3$ to $Lu(OH{)}_3$. Basic nature is inversely proportional to the atomic number.

$3$. Lanthanides do not form coordinate compounds as readily as d-block metals. Thus lanthanoids show less tendency to form complexes.

Thus statements 1 and 3 are correct and statement 2 is incorrect. Hence, option B is the correct answer.