All India Engineering / Architecture Entrance Examination (AIEEE)

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AIEEE 2009 Chemistry

 Q. 12. Buna–N synthetic rubber is a copolymer of:

Sol.: Buna–N is a copolymer of buta–1,3–diene and acrylonitrile.

Answer : (4)

Q. 13. Which of the following statements is incorrect regarding physiosorption?

1. Enthalpy of adsorption is low and positive.
   
   
2. It occurs because of Van der Waal’s forces.
   
   
3. More easily liquefiable gases are adsorbed readily.
   
   
4. Under high pressure it results into multi molecular layer on adsorbent surface.

Sol.:  for adsorption is negative. Adsorption is a spontaneous process, so  is negative and  in case of adsorption is also negative.

 Answer : (1)

Q. 14. The number of stereoisomers possible for a compound of the molecular formula Me is:

1. 6
   
   
2. 3
   
   
3. 2
   
   
4. 4

Sol:   
 
Isomer 1: cis d ; Isomer 2: cis l ; Isomer 3: trans d ; Isomer 4: trans l

Answer : (4)