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IB
S2.2.4 VSEPR theory

IB Chemistry S2.2.4 VSEPR Theory Questionbank

IB Chemistry Topic S2.2.4 VSEPR Theory Questionbank… | RevisionDojo

Paper

Level

Question

HLPaper 2

Phosgene ( $COCl_2$ ) is a colorless gas used extensively in the industrial synthesis of polyurethanes and pesticides. A 3D ball-and-stick model of the phosgene molecule is shown below:

Phosgene Structure

(a)

State the number of valence electrons shared between the carbon atom and the oxygen atom in phosgene.

[1]

(b)

Identify the molecular geometry around the central carbon atom in $COCl_2$ .

[1]

(c)

IB Chemistry Topic S2.2.4 VSEPR Theory Questionbank

Practice IB Chemistry Topic S2.2.4 VSEPR Theory with authentic exam-style questions for both SL and HL students. This question bank focuses on the exact syllabus content for S2.2.4 VSEPR Theory and mirrors Paper 1A, 1B, 2 style where relevant.

Get instant solutions, detailed explanations, and build confidence with questions aligned to IB examiner expectations.

Deduce the total number of non-bonding (lone) electron pairs present in one molecule of phosgene.

[1]

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(d)

The measured $Cl–C–Cl$ bond angle in phosgene is $111.8^\circ$ .

Suggest why this angle is smaller than the ideal $120^\circ$ predicted for a trigonal planar arrangement, referring to electron domain repulsion.

[2]

(e)

The molar mass of phosgene is $98.91 \text{ g mol}^{-1}$ .

Calculate the percentage by mass of chlorine in a sample of pure phosgene. [Relative atomic mass: $Cl = 35.45$ ]

[2]

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