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Choose the INCORRECT statement (1) Among the isotopes of carbon, 13C is a radioactive isotope. (2) Carbon exhibits negative oxidation states along with +4 and +2. (3) Carbon cannot exceed its covalency more than four. (4) CO2 is the most acidic oxide among the dioxides of group 14 elements.

1. (1) Among the isotopes of carbon, 13C is a radioactive isotope.
2. (2) Carbon exhibits negative oxidation states along with +4 and +2.
3. (3) Carbon cannot exceed its covalency more than four.
4. (4) CO2 is the most acidic oxide among the dioxides of group 14 elements.

Correct answer: (1) Among the isotopes of carbon, 13C is a radioactive isotope.

Solution

The statement is incorrect because 13C is a stable isotope of carbon, not a radioactive one; only 14C is radioactive.

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