Consider the following statements:I. All isot | vedclass

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(A) Statement $I$ is incorrect because isotopes of an element have the same number of protons but different numbers of neutrons.Statement $II$ is inco

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Statements $III$ and $IV$ are correct

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(A) Statement $I$ is incorrect because isotopes of an element have the same number of protons but different numbers of neutrons.Statement $II$ is incorrect because some elements have multiple stable isotopes (e.g.,oxygen has three stable isotopes: $^{16}O, ^{17}O, ^{18}O$).Statement $III$ is correct because every element has isotopes,which are atoms with the same atomic number but different mass numbers.Statement $IV$ is correct because isotopes of the same element exhibit identical chemical properties; therefore,all carbon isotopes $(^{12}C, ^{13}C, ^{14}C)$ can react with oxygen to form compounds like $CO_2$.Thus,only statements $III$ and $IV$ are correct.

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