Chapter 21: Class 7 Science Exam Tests
Class 7 Science MCQs - Chapter 21
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MCQ 1: Chalk, limestone, marble, eggshells and seashells are made of
MCQ 2: The conservation of mass is obtained when the total mass of reactants is equal to total mass of
MCQ 3: Chemical changes are
MCQ 4: If baking soda or fruit salt is mixed with vinegar, there takes place a
MCQ 5: Burning of fossils fuel results in the production of
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