DP Chemistry (last assessment 2024)

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Question 22M.2.hl.TZ1.6a(iii)

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Date May 2022 Marks available [Maximum mark: 3] Reference code 22M.2.hl.TZ1.6a(iii)
Level hl Paper 2 Time zone TZ1
Command term Explain Question number a(iii) Adapted from N/A
a(iii).
[Maximum mark: 3]
22M.2.hl.TZ1.6a(iii)

Nitric acid is usually produced by the oxidation of ammonia.

(a(iii))

Explain the relative lengths of the three bonds between N and O in nitric acid.

[3]

Markscheme

Any three of:

two N-O same length/order ✔
delocalization/resonance ✔

N-OH longer «than N-O»
OR
N-OH bond order 1 AND N-O bond order 1½ ✔

 

Award [2 max] if bond strength, rather than bond length discussed.

Accept N-O between single and double bond AND N-OH single bond.

Examiners report

Poorly done; some explained relative bond strengths between N and O in HNO3, not relative lengths; others included generic answers such as triple bond is shortest, double bond is longer, single longest.

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