Chemical Reaction Engineering
Photochemical reaction rate does not depend significantly on temperature, because

It is an exothermic reaction
It is a reversible reaction
The energy of reacting molecules exceeds the activation energy by absorption of light
None of these

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Chemical Reaction Engineering
In a zero order reaction, reactants concentration does not change with time and the

Time for half change is independent of the initial concentration
Time for completion of the reaction is independent of the initial concentration
Time for half change is half the time taken for completion of the reaction
Reaction rate is trebled when the initial concentration is trebled

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