Which of the following statements is INCORREC | vedclass

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(A) . Due to lanthanide contraction,the ionic radius decreases from $La^{3+}$ to $Lu^{3+}$. According to Fajan's rule,as the size decreases,the covale

Vedclass · Accepted Answer

$Lu(OH)_3$ is more basic compared to $La(OH)_3$.

Vedclass · Answer

(A) . Due to lanthanide contraction,the ionic radius decreases from $La^{3+}$ to $Lu^{3+}$. According to Fajan's rule,as the size decreases,the covalent character increases,which leads to a decrease in basic strength. Thus,$La(OH)_3$ is more basic than $Lu(OH)_3$. Therefore,the statement in option $A$ is $INCORRECT$.$B$. Lanthanide carbides $(LnC_2)$ contain the $C_2^{2-}$ ion,which reacts with water to produce acetylene $(C_2H_2)$.$C$. Cerium sulfide $(CeS)$ is highly stable and is used in the manufacture of crucibles.$D$. Misch-metal,an alloy of lanthanoids (approx. $95\%$) and iron (approx. $5\%$) with traces of $S, C, Ca,$ and $Al$,is used in cigarette lighters.

Which of the following statements is $INCORRECT$?

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