JEE Mains · Chemistry · STD 11 -p-Block elements - I

Choose the INCORRECT statement

A Among the isotopes of carbon, \({}^{13}C\) is a radioactive isotope.
B Carbon exhibits negative oxidation states along with +4 and +2.
C Carbon cannot exceed its covalency more than four.
D \(CO_{2}\) is the most acidic oxide among the dioxides of group of 14 elements.

Verified Solution

Answer & Solution

Correct Answer

(A) Among the isotopes of carbon, \({}^{13}C\) is a radioactive isotope.

Step-by-step Solution

Detailed explanation

\(C^{13}\) is not radioactive \(C^{14}\) is radioactive

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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