IGCSE A Level Chemistry Competitive Exam MCQs – Practice Test 21 (Chapter 13)
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MCQ 101: In the Period table, the elements with 2 electrons in the outermost principal quantum shell are present in:
MCQ 102: In chlorination of water, reactive oxygen atoms are produced by:
MCQ 103: Concrete sets when arranged with iron rods passes through it, improves it:
MCQ 104: When calcium oxide is burned with clay its makes:
MCQ 105: As we go down the Group-II, metals become:
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