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Allotropes of oxygen are :

$(a)\;O_4\;and\;O_2\qquad(b)\;O_3\;and\; O_2\qquad(c)\;O_2\;and\;O_3\qquad(d)\;O\;and\;O_2$

1 Answer

he existence of two or more alternative forms of the same element in the same physical state.
Normal oxygen and ozone
Two allotropes of oxygen are: Molecular oxygen $(O_2)$, also known as diatomic oxygen. Ozone $(O_3)$, also known as triatomic oxygen.
(i.e) $O_2$ and $O_3$
Hence (c) is the correct answer.
answered Nov 26, 2013 by sreemathi.v
edited Mar 25 by sharmaaparna1