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(D) Let us analyze each statement:$1$. $CrO$ is a basic oxide,while $Cr_2O_3$ is amphoteric. This statement is correct.$2$. In an acidic medium,$KMnO_

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The reactivity of the earlier members of lanthanide series is similar to that of aluminium

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(D) Let us analyze each statement:$1$. $CrO$ is a basic oxide,while $Cr_2O_3$ is amphoteric. This statement is correct.$2$. In an acidic medium,$KMnO_4$ oxidizes nitrite $(NO_2^-)$ to nitrate $(NO_3^-)$. This statement is correct.$3$. The Wacker process involves the oxidation of ethylene to acetaldehyde using $PdCl_2$ as a catalyst and $CuCl_2$ as a co-catalyst. This statement is correct.$4$. The reactivity of the earlier members of the lanthanide series is similar to that of calcium $(Ca)$,not aluminium $(Al)$. Lanthanides are highly electropositive metals,and their chemical behavior is comparable to alkaline earth metals like calcium. Therefore,this statement is incorrect.

Which one of the following statements is not correct?

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