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Today i am going to discuss on some “tricky” exam-based questions that were sent in by my own student under our Chemistry Ultimate Leap Programme, for discussion below:
Hi Sean, I have a few chemistry questions which I am unsure about.
Question 1: on Properties of Gases
A sample of polluted air is bubbled through water. The pH of the solution is less than 7. What gas causes this?
A. Carbon dioxide
B. Carbon monoxide
C. Sulfur dioxide
D. AmmoniaSuggested Answer by Student X:
My answer is carbon dioxide because it is an acidic gas and would thus form an acidic solution. But the correct answer is C. Sulfur dioxide. Why?
& [Read more…] about O Levels Chemistry – Selected Exam Questions