Adsorption of a gas on the surface of a solid adsorbent is ……….(exothermic or endothermic or neither exothermic nor endothemic).

Explanation

To determine whether the adsorption of a gas on the surface of a solid adsorbent is exothermic or endothermic, we can follow these steps:

### Step 1: Understand Adsorption
Adsorption is the process where gas molecules adhere to the surface of a solid. This process involves the interaction between the gas molecules and the surface of the solid adsorbent.

**Hint:** Recall that adsorption is different from absorption; adsorption involves surface interaction.

### Step 2: Analyze the Energy Changes
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