Download Simple Chemical Reactions MCQs App | Class 7 Science e-Book PDF
Class 7 Science Study Guide: Practice Test 1 (Chapter 20)
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Chalk, limestone, marble, eggshells and seashells are made of
The conservation of mass is obtained when the total mass of reactants is equal to total mass of
Chemical changes are
If baking soda or fruit salt is mixed with vinegar, there takes place a
Burning of fossils fuel results in the production of
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