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Which one of the following processes does NOT use adsorption?

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Important Questions on Surface Chemistry

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Under what condition, will x/m value be equal to pressure of the gas on the surface of the absorbent?
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The catalyst for the oxidation of SO2 to SO3 in the manufacture of sulphuric acid by Contact process is
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Which of the following is the CORRECT increasing order of coagulating power of electrolytes required to precipitate a negatively charged As2S3 colloid ?