O-LevelChemistryStoichiometry5070/12 · Oct/Nov 2023 · Q71 Mark

Which row shows a pair of molecules where the Mr of compound X is exactly half that of compound Y? [Ar: C, 12; Cl, 35.5; H, 1; Ο, 16]

ACH3CH2CH3, CO2

BCH3CH2Cl, CH2ClCH2Cl

CCH3CO2H, CH3CH2CH3

DCO2, CH3CO2C2H5

✓ Correct answer

D: CO2, CH3CO2C2H5

Oracle Prep sorts past-paper questions by topic, so you can drill Stoichiometry and see which topics are most likely to come up next.

Topic: Stoichiometry, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, Oct/Nov 2023 Paper 1 Variant 2, question 7.

Questions and mark schemes are from past examination papers and remain the copyright of the exam board. How Oracle Prep builds its content

The empirical formula of a liquid compound is C2H4O. To find the empirical formula, it is necessary to know the

A mixture of two substances is spotted onto a piece of chromatography paper. The paper is inserted into a beaker cont…

15.0 cm³ of 1.0mol/dm³ potassium hydroxide just neutralise 20.0 cm³ of a solution of nitric acid. What is the concent…

When a compound X is reacted with sodium carbonate, carbon dioxide gas is evolved. What could be the formula of compo…

A student measured the rate of reaction between calcium carbonate and dilute hydrochloric acid. A graph showing the v…

Which molecule contains a total of three covalent bonds?