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Give reasons:
a) All decomposition reactions are endothermic reaction.
b) Respiration is exothermic reaction.
c) Magnesium ribbon should be rubbed before burning.
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Explanation:
1. decomposition is a chemical reaction where a single substance breaks into two or more simple substances when heated. The reaction is usually endothermic because heat is required to break the bonds present in the substance
2. Respiration is considered as an exothermic reaction because in respiration oxidation of glucose takes place which produces large amount of heat energy.
3. To remove the Magnesium oxide layer from the ribbon which may prevent or slow down the burning of magnesium ribbon
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