IGCSE O Level Chemistry Exam MCQs – Practice Test 4 (Chapter 9)
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MCQ 16: What is true about pure substances?
MCQ 17: Oil and water is an example of:
MCQ 18: Dissolving, filtering and evaporating are the methods of:
MCQ 19: Crystallization of microchips does not involve:
MCQ 20: Fresh seawater is referred to as impure water because it contains:
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