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Question 19M.2.hl.TZ2.d(ii)

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Date May 2019 Marks available [Maximum mark: 1] Reference code 19M.2.hl.TZ2.d(ii)
Level hl Paper 2 Time zone TZ2
Command term State Question number d(ii) Adapted from N/A
d(ii).
[Maximum mark: 1]
19M.2.hl.TZ2.d(ii)

Dinitrogen monoxide, N2O, causes depletion of ozone in the stratosphere.

The Lewis (electron dot) structure of the dinitrogen monoxide molecule can be represented as:

State, giving a reason, the shape of the dinitrogen monoxide molecule.

[1]

Markscheme

linear AND 2 electron domains

OR

linear AND 2 regions of electron density    [✔]

 

Note: Accept “two bonds AND no lone pairs” for reason.

Examiners report

Though quite a number of candidates suggested a linear shape correctly, they often failed to give a complete correct explanation, just mentioning the absence of lone pairs but not two bonds, instead of referring to electron domains.

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