Chapter 18: Class 7 Science Exam Tests
Class 7 Science MCQs - Chapter 18
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MCQ 16: The chemist who started plastic industry was an
MCQ 17: Ethene is obtained from
MCQ 18: Two major requirements for preparation of ammonia are
MCQ 19: The melting point of ice is
MCQ 20: When heat is provided to particles of solids, they gain
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