Chapter 3: Class 9 Chemistry Exam Tests
Class 9 Chemistry MCQs - Chapter 3
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MCQ 16: The smallest part of an element that cannot exist as a free state is
MCQ 17: A free radical has
MCQ 18: Branch of chemistry dealing with the plantation and overcoming greenhouse effect is
MCQ 19: 1 mole of a substance refers to
MCQ 20: The number of protons in the nucleus constitute it's
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