MCQs: The conservation of mass is obtained when the total mass of reactants is equal to total mass of
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MCQs: Chemical changes are
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MCQs: If baking soda or fruit salt is mixed with vinegar, there takes place a
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MCQs: Burning of fossils fuel results in the production of
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MCQs: At room temperature iron and sulphur
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MCQs: If both water and carbon dioxide is given to plant it will not be able to prepare its own food in absence of
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MCQs: Melting, freezing, boiling, evaporation and condensation are all
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MCQs: Chemical change involves the formation of
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MCQs: The change which is not accompanied by formation of new substance is called a
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MCQs: Dilute acids and alkalis react together to form
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MCQs: Fuel obtained from fossils is known as
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MCQs: The process in which reactants react together to form a product, is called
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MCQs: If two or more substances are combined to form a new substance, the chemical reaction is termed as
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MCQs: When substance combines with oxygen while burning, the reaction is termed as
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MCQs: The process of breaking down of any substance into smaller substances by heating, is called
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MCQs: Zinc salt reacts with dilute shulphuric acid to form zinc salt and
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MCQs: Natural gas is made up of compound
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MCQs: Power machines in factories and vehicles are examples of
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MCQs: Natural gas is more efficient and produces less
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MCQs: In physical changes the solutes and solvents can easily be separated by
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