CUET · CHEMISTRY · PYQ PAPER 2023
Answer the question on the basis of passage given below :
Adsorption is a surface phenomenon and it differs from absorption which occurs throughout the body of the substance that absorbs. In physiosorption the attractive forces are mainly van der Waal's forces while in chemisorption ionic/covalent bonds are formed between particles of adsorbent and adsorbate. The catalytic activity of finely divided iron in Haber's process of ammonia manufacture can be explained by adsorption theory. Adsorption being an exothermic process, the heat of adsorption is utilised in enhancing the rate of the reaction. Adsorption has many applications being used in gas masks, control of humidity, chromatograph separation, curing diseases etc.
Which of the following is not correct regarding the adsorption of a gas on the surface of solid ?
(A) On increasing temperature, adsorption increases continuously.
(B) Enthalphy and entropy changes are negative.
(C) Chemical adsorption is more specific than physical adsorption.
(D) High temperature favours physical adsorption.
Choose the correct answer from the options given below :
- A (A) and (D) only
- B (A) and (C) only
- C (B) and (D) only
- D (B) and (C) only
Answer & Solution
Correct Answer
(A) (A) and (D) only
Step-by-step Solution
Detailed explanation
(A) On increasing temperature, adsorption decreases. So, (A) is not correct. (D) High temperature favours desorption, not physical adsorption. So, (D) is not correct. Incorrect statements are (A) and (D). (A) and (D) only
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