It is called irreversible adsorption, if the adsorbate can not be removed from the surface of the adsorbent.. A gas adsorbed on a solid surface can be completely removed in vacuum. The bulk phases may be solid – liquid, solid – gas, solid – vacuum, liquid – gas etc. These Surface Chemistry Class 12 Best Handwritten Notes in Pdf will help you to prepare different competitive exams like GATE, PSUs and so on. Answers of assignment are given at the end of each assignment with complete solutions. Class-XI Physics Handwritten Notes Ch 1: Physical World Ch 2: Units and Measurements Ch 3: Motion in a Straight Line Ch 4: Motion in a Plane (a)Vectors (b) Projectile Ch 5: Laws of Motion Ch 6: Work,Energy and Power Ch 7: System of Particles & Rotational Motion Ch 8: … It is the study of the chemical phenomena that occur at the interface of two surfaces which can be solid-liquid, solid-gas, solid-vacuum, liquid-gas, etc. What is Surface Chemistry? 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