DP Chemistry (first assessment 2025)

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Question SPM.1A.SL.TZ0.20

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Date May Specimen-2023 Marks available [Maximum mark: 1] Reference code SPM.1A.SL.TZ0.20
Level SL Paper 1A Time zone TZ0
Command term Question number 20 Adapted from N/A
20.
[Maximum mark: 1]
SPM.1A.SL.TZ0.20

The complete combustion of 20.0 cm3 of a gaseous hydrocarbon, CxHy, produces 80.0 cm3 of gaseous products. This volume reduces to 40.0 cm3 when the water vapour present condenses. All volumes are measured at the same temperature and pressure.


What is the molecular formula of the hydrocarbon?


A.  CH4

B.  C2H2

C.  C2H4

D.  C3H6

[1]

Markscheme

C