Classify the following into exothermic and endothermic reactions :
1. Quick lime is added to water
2. Potassium chlorate is heated
3. Sodium dissolved in water
4. Mercuric oxide is strongly heated
5. Neutralization of NaOH and HCl
6. Calcium carbonate is strongly heated
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Explanation:
(A)In electrolysis of water heat energy is used to convert water into hydrogen and oxygen.
2H2O=2H2+O2
it is an endothermic reactions
(B)conversion of limestone into quicklime can be done by heating limestone.
CaCO3=CaO+CO2
it is an endothermic reaction.
(C)During respiration breakdown of glucose in presence of oxygen releases energy, therefore it is an exothermic process
C6H12O6+6O2=6H2O+6Co2 + energy
(D)In process of photosynthesis- light energy is used to convert carbon dioxide and water into glucose and oxygen
6CO2+H2O=C6H12O6+6O2...
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