All India Engineering / Architecture Entrance Examination (AIEEE)

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AIEEE 2009 Chemistry

Q. 18. The major product obtained on interaction of phenol with sodium hydroxide and carbon dioxide is:

1. phthalic acid
   
   
2. benzoic acid
   
   
3. salicylaldehyde
   
   
4. salicylic acid

Sol: 
.

Answer: (4)

 Q. 19. Solid Ba(NO₃)₂ is gradually dissolved in solution. At what concentration of Ba²⁺ will a precipitate begin to form?

Sol: Concentration of Ba²⁺ needed to precipitate

Answer: (3)

Q. 20. Which one of the following reactions of xenon compounds is not feasible?

Sol: XeF6 reacts violently with water and gets hydrolysed to give highly explosive XeO₃.

; Reaction (2) is reverse of this, so it is not feasible.

Answer: (2)