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In the adsorption of a gas on a solid surface, the graph between log(x/m) and log P is a straight line. If n is a whole number, what does the slope of this line represent?

1. k
2. log k
3. n
4. 1/n

Correct answer: 1/n

Solution

Freundlich isotherm log(x/m) = log k + (1/n) log P, so a plot of log(x/m) vs log P has slope = 1/n.

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