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• AIPMT 2010 Chemistry

AIPMT 2010 Chemistry

  

Q. 22. Which one of the following ions has electronic configuration [Ar] 3d⁶?

1. 
    
2. 
   
3. 
   
4. 
   

(At. Nos. Mn = 25, Fe = 26, Co = 27, Ni = 28)

Sol:

Answer : (4)

Q. 23. Which of the following statements about primary amines is ‘False’?

1. Alkyl amines are stronger bases than aryl amines
2. Alkyl amines react with nitrous acid to produce alcohols
3. Aryl amines react with nitrous acid to produce phenols
4. Alkyl amines are stronger bases than ammonia

Sol:

Aryl amines will not produce phenol on Treatment with nitrous acid.

Answer : (3)

Q. 24. An aqueous solution is 1.00 molal in KI. Which change will cause the vapour pressure of the solution to increase?

1. Addition of NaCl
2. Addition of
3. Addition of 1.00 molal KI
4. Addition of water

Sol:

When the aqueous solution of one molal KI is diluted with water, concentration decreases, therefore the vapour pressure of the resulting solution increases.

Correct choice : (4)