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    				| 1. | 9.The heat content of Y is greater than that of x,the reaction X → Y is:(1) Spontaneous(3) Endothermic (4) Instantaneous(2) Exothermic | 
| Answer» Chemical reactions that release energy are called exothermic. In exothermic reactions, more energy is released when thebondsare formed in the products than is used to break thebondsin the reactants. Chemical reactions that absorb (or use) energy are called endothermic. hence, option (c) is correct. | |