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When a gas is adsorbed at high pressure so that the whole surface becomes covered by a single molecular layer, the adsorption behavior follows which order?

1. Three-halved order
2. Second-order
3. First-order
4. Zero-order

Correct answer: Zero-order

Solution

In zero-order adsorption, the rate of adsorption is constant and independent of the concentration of the gas, which occurs when the surface is fully covered by a single molecular layer at high pressure.

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