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For a chemical reaction it is usually found that the reaction rate is faster at higher temperature. The rate increases because
(a) the concentrations of reactants increase
(b) more reactants collide with energy equal to or greater than the activation energy
(c) the concentrations of products increase
(d) the volume expands and there is more room for new compounds (products) to form

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Littlestarid
the correct option here is B) more reactants collide with energy equal to or greater than the activation energy...
when the molecules collide with each other due to high temperature they gain kinetic energy and the energy required to start the reaction decreases and reaction starts at lower energy at high rate ...

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