All India Engineering / Architecture Entrance Examination (AIEEE)

AIEEE 2010 Chemistry

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Q. 3. The time for half life period of a certain reaction A Products is 1 hsour. When the initial concentration of the reactant ‘A’, is 2.0 mol L-1, how much time does it take for its concentration to come from 0.50 to 0.25 mol L-1 if it is a zero order reaction?

  1. 4 h
  2. 0.5 h
  3. 0.25 h
  4. 1 h

Sol:

Answer: 3

Q. 4. The standard enthalpy of formation of NH3 is – 46.0 kJ mol-1. If the enthalpy of formation of H2 from its atoms is – 436 kJ mol-1 and that of N2 is – 712 kJ mol-1, the average bond enthalpy of N–H bond in NH3 is

  1. – 964 kJ mol-1
  2. + 352 kJ mol-1
  3. + 1056 kJ mol-1
  4. – 1102 kJ mol-1

Sol :

Answer: 2

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