NEET · Chemistry · STD 11 - 4. Chemical bonding and molecular structure

Which one of the following species has plane triangular shape ?

A \(N_3\)
B \(NO_{3}^-\)
C \(NO_{2}^-\)
D \(CO_2\)

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Answer & Solution

Correct Answer

(B) \(NO_{3}^-\)

Step-by-step Solution

Detailed explanation

Species with \(s p^{2}\) hybridisation are plane triangular in shape. Among the given species \(N O_{3}^{-}\) is \(s p^{2}\) hybridised with no lone pair of electrons on central atom, \(N\). Whereas, \(N_{3}, N O_{2}^{-}\) and \(CO_{2}\) are sp hybridised with a linear shape.

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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Match the following columns and select the correct option

Column \(I\)	Column \(II\)
(\(a\)) Pneumotaxic Centre	(\(i\)) Alveoli
(\(b\)) \(O _{2}\) Dissociation curve	(\(ii\)) Pons region of brain
(\(c\)) Carbonic Anhydrase	(\(iii\) Haemoglobin
(\(d\)) Primary site of exchange of gases	(\(iv\)) \(R.B.C.\)

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