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vií) Distinguish between photochemical reaction and thermochemicalreaction. |
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Answer» THERMOCHEMICAL REACTIONS :- These reactions involve absorption or evolution of heat. They can take place even in absence oflighti.e. dark. Temperature has significant effect on the rate of a thermochemical reaction. The free energy change ∆G of a thermochemical reaction is always negative. They are accelerated by the presence of a catalyst. PHOTOCHEMICAL REACTIONS :- These reactions involve absorption of light. The presence of light is the primary requisite for the reaction to take place. Temperature has very little effect on the rate of a photochemical reaction. Instead, the intensity of light has a marked effect on the rate of a photochemical reaction. The free energy change ∆G of a photochemical reaction may not be negative. Some of these are initiated by the presence of a photosensitizer. However a photosensitizer acts in a different way than a catalyst. right thankss rupak ji |
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