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PIMSO 2025 - Science - Secondary 4 - National Round Question 9

PIMSO Science · PIMSO 2025 - Science - Secondary 4 - National Round

Question 9

Elemental analysis of a hydrocarbon $\mathrm{C_xH_yO_z}$ yielded showed it contains 54.5 % C and 9.1 % H. Which of the following hydrocarbons could correspond to this sample? (Use the following atomic weights: C=12, O=16, H=1) i. CH₂O ii. C₂H₄O₂ iii. C₂H₄O iv. C₄H₈O₂

A. i only
B. ii only
C. ii and iii
D. ii and iv

Editorial review: assess the printed choices and explain any scientific inconsistency. State any assumptions used.