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At constant temperature, the Freundlich adsorption relation for a gas adsorbed on a solid can be written in terms of the amount adsorbed per unit mass of adsorbent as:

1. log x/m = log p + 1/n log k
2. log x/m = log k + 1/n log p
3. x/m ∝ pⁿ
4. x/m = log p + 1/n log k

Correct answer: log x/m = log k + 1/n log p

Solution

The correct option expresses the Freundlich adsorption isotherm in a logarithmic form, where the amount adsorbed per unit mass of adsorbent (x/m) is related to the pressure (p) and constants (k and n). This relationship indicates that as pressure increases, the amount adsorbed also increases, following a specific non-linear pattern.

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