IGCSE A Level Chemistry MCQs – Practice Test 10 (Chapter 20)
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MCQ 46: Ammonium salts include:
MCQ 47: Acid rain has effects on:
MCQ 48: SO2 left at the end of the contact process should not be escaped as it can cause:
MCQ 49: Nitrogen gas is found in a group of the periodic table of:
MCQ 50: Bacteria decompose dead plants and algae by increasing their growth rate and using:
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