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# The standard reduction potentials (E$^{\circ}$ ) of the lanthanides for M$^{+3}$ (aq) + 3e$^{-} \overset{\Delta} \rightarrow$ M (s) all fall between –2.52 V (La) and –2.25 V (Lu). This helps explain which of the following properties of Lanthanides?

(1) Lanthanides are good reducing agents (2) Lanthanide contraction (3) Electropositivity of Lanthanide series decreases from La to Lu (4) Lanthanides react rapidly with hot water and slowly with cold water (5) Lanthanides are soft, malleable and ductile

$\quad$ Reducing nature $\propto$ E$^{\circ}$. As they have a high negative value of E$^{\circ}$, they are good reducing agents.
$\quad$ Since Electropositivity is the tendency to lose electrons, and Electropositivity $\propto$ E$^{\circ}$, this value decreases from La to Lu.
$\quad$ Lanthanides liberate H$_2$ due to their high negative E$^{\circ}$.