(A) Oxygen commonly exhibits an oxidation state of $-2$, but it also shows $-1$ (in peroxides), $-1/2$ (in superoxides), and even positive states when

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Oxygen exhibits only $-2$ oxidation state.

(A) Oxygen commonly exhibits an oxidation state of $-2$, but it also shows $-1$ (in peroxides), $-1/2$ (in superoxides), and even positive states when combined with fluorine (e.g.,$OF_2$). Therefore, the statement that oxygen exhibits only $-2$ oxidation state is incorrect.

Class 11 Chemistry p-Block Elements (Class 11)Carbon family

Medium

Identify the incorrect statement from the following:

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A
Oxygen exhibits only $-2$ oxidation state.
B
The order of catenation property of Group $14$ elements is $C \gg Si > Ge \approx Sn$.
C
Carbon has the ability to form $p\pi-p\pi$ multiple bonds with itself.
D
$ECl_3$ ($E = B$ and $Al$) is a monomer when $E = B$ and a dimer when $E = Al$.