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AIEEE 2010 Chemistry Solved Paper

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Q. 28. 29.5 mg of an organic compound containing nitrogen was digested according to Kjeldahl’s method and the evolved ammonia was absorbed in 20 mL of 0.1 M HCl solution. The excess of the acid required 15 mL of 0.1 M NaOH solution for complete neutralization. The percentage of nitrogen in the compound is

  1. 59.0
  2. 47.4
  3. 23.7
  4. 29.5

Sol :
Mass of organic compound
Initial moles of HCl taken
Moles of NaOH reacted with excess of HCl
Moles of excess of HCl
Moles of HCl that reacted with
Moles of NH3 absorbed
Moles of N in NH3
Mass of N in organic compound

Answer: (3)

Q. 29. Consider the reaction:

The rate equation for this reaction is s
Rate = k[Cl2] [H2S]
Which of these mechanisms is/are consistent with this rate equation?

(A)

(B)

  1. (B) only
  2. Both (A) and (B)
  3. Neither (A) nor (B)
  4. (A) only

Sol : According to mechanism (A) the rate law expression is

Answer: 4

Q. 30. One mole of a symmetrical alkene on ozonolysis gives two moles of an aldehyde having a molecular mass of 44 u. The alkene is.

  1. propene
  2. 1-butene
  3. 2-butene
  4. ethene

Sol :

Molecular mass of CH3CHO is 44 u.

Answer: (3)

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