Chapter 18: Class 7 Science Exam Tests
Class 7 Science MCQs - Chapter 18
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MCQ 31: To make PVC, molecules of vinyl chloride are
MCQ 32: When particles cool down, energy changes
MCQ 33: The color of magnesium oxide is
MCQ 34: Ammonia fertilizers are made by two components, they are
MCQ 35: During chemical reaction, energy is
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