Download Simple Chemical Reactions MCQ App | Class 7 Science e-Book PDF
Class 7 Science Entrance Tests: Practice Test 2 (Chapter 20)
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At room temperature iron and sulphur
If both water and carbon dioxide is given to plant it will not be able to prepare its own food in absence of
Melting, freezing, boiling, evaporation and condensation are all
Chemical change involves the formation of
The change which is not accompanied by formation of new substance is called a
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