Chapter 21: Class 7 Science Exam Tests
Class 7 Science MCQs - Chapter 21
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MCQ 6: At room temperature iron and sulphur
MCQ 7: If both water and carbon dioxide is given to plant it will not be able to prepare its own food in absence of
MCQ 8: Melting, freezing, boiling, evaporation and condensation are all
MCQ 9: Chemical change involves the formation of
MCQ 10: The change which is not accompanied by formation of new substance is called a
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