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What happens during a non-steady state diffusion?

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What happens during a non-steady state diffusion?

(a) The composition behavior does not change with time

(b) The composition behavior changes with time

(c) The diffusion can be described by Mond’s Second Law

(d) Zero composition

I have been asked this question in exam.

My query is from Uses and Limitations of Phase Rule topic in division Phase Rule of Engineering Chemistry I

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Right choice is (d) Zero composition

The explanation: Only during a steady state reaction (invariant reaction), the composite and other parameters like concentration, temperature, pressure, solubility etc can be determined. Hence under non- equilibrium conditions, all the above parameters are negligible and hence there is zero composition.

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