When O_2 is adsorbed on a metallic surface, electron transfer occurs from the metal to O_2 . The **TRUE** statement(s) regarding this adsorption is(are)

JEE Advanced 2015 Chemistry question

When is adsorbed on a metallic surface, electron transfer occurs from the metal to . The **TRUE** statement(s) regarding this adsorption is(are)

(A) is physisorbed
(B)heat is releasedCorrect
(C)occupancy of of is increasedCorrect
(D)bond length of is increasedCorrect

Answer: (B),(C),(D)

Solution

Electron transfer from the metal means a chemical bond is formed between the surface and , so this is chemisorption, not physisorption: (A) false. Adsorption is accompanied by a decrease in entropy and is spontaneous, so it is

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Question ID VK-026458