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1. For a first order isothermal chemical reaction in a porous catalyst, the effectiveness factor is 0.3. The effectiveness factor will increase if the
(A): catalyst size is reduced or the catalyst diffusivity is reduced.
(B): catalyst size is reduced or the catalyst diffusivity is increased.
(C): catalyst size is increased or the catalyst diffusivity is reduced.
(D): catalyst size is increased or the catalyst diffusivity is increased.
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