Select the correct statement.

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(A) $1$. Physical adsorption (physisorption) is exothermic and decreases with an increase in temperature. Chemical adsorption (chemisorption) often in

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Both chemical and physical adsorption increase with an increase in pressure.

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(A) $1$. Physical adsorption (physisorption) is exothermic and decreases with an increase in temperature. Chemical adsorption (chemisorption) often increases initially with temperature due to activation energy requirements.$2$. Both physical and chemical adsorption increase with an increase in pressure as more gas molecules are forced onto the surface.$3$. Physisorption is reversible and forms multilayers,whereas chemisorption is irreversible and forms a monolayer.$4$. Therefore,the correct statement is that both increase with an increase in pressure.

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