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Question

You are monitoring the diffusion of a coloured molecules across a membrane. Which of the following result in the fastest rate of diffusion?

A
An internal concentration of 5% and an external concentration of 60%
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B
An internal concentration of 35% and an external concentration of 40%
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C
An internal concentration of 60% and an external concentration of 5%
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D
A and C are correct
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Solution

The correct option is D A and C are correct
Diffusion is the net passive movement of particles (atoms, ions or molecules) from a region in which they are in higher concentration to regions of lower concentration. It continues until the concentration of substances is uniform throughout. Diffusion rate becomes fastest when there is a difference of 50-55% between the internal and external concentration across a membrane.
So, the correct option is 'A and C are correct'.

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