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All India Engineering / Architecture Entrance Examination (AIEEE)

AIEEE 2010 Chemistry

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