Chapter 21: Class 7 Science Exam Tests
Class 7 Science MCQs - Chapter 21
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MCQ 16: The process of breaking down of any substance into smaller substances by heating, is called
MCQ 17: Zinc salt reacts with dilute shulphuric acid to form zinc salt and
MCQ 18: Natural gas is made up of compound
MCQ 19: Power machines in factories and vehicles are examples of
MCQ 20: Natural gas is more efficient and produces less
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