AP EAMCET · Chemistry · Chemical Bonding and Molecular Structure

The incorrect statement among the following is /are

A ${NCl}_{5}$ does not exist while ${PCl}_{5}$ does
B $Pb$ prefers to form tetravalent compounds
C The three $C - O$ bonds are equal in the ${CO}_{3}^{2 -}$ ion
D Both $O_{2}^{+}$ and $NO$ are paramagnetic

Verified Solution

Answer & Solution

Correct Answer

(B) $Pb$ prefers to form tetravalent compounds

Step-by-step Solution

Detailed explanation

NCl5 does not exist while PCl5 does because nitrogen does not have vacant d orbitals while phosphorous contains d orbitals. Pb shows the inert pair effect, due to this most of the lead compounds are divalent not tetravalent. All the bonds of CO32- are equal due to resonance…

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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