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All India Engineering / Architecture Entrance Examination (AIEEE)

CBSE Guess > AIEEE > AIEEE Papers > 2009 > Chemistry

AIEEE 2009 Chemistry

Q. 4. In a fuel cell, methanol is used as fuel and oxygen gas is used as an oxidizer. The reaction is; At 298 K standard Gibb’s energies of formation for CH3OH(l), H2O(l) and CO2(g) are –166.2, –237.2 and –394.4 kJ mol–1 respectively. If standard enthalpy of combustion of methanol is –726 kJ mol–1, efficiency of the fuel cell will be

  1. 97%

  2. 80%

  3. 87%

  4. 90%

Sol:
 
Answer : (1)

Q. 5. On the basis of the following thermochemical data:

  1. -343.52 kJ

  2. -22.88 kJ

  3. -228.88 kJ

  4. +228.88 kJ

Q. 6. The half life period of a first order chemical reaction is 6.93 minutes. The time required for the completion of 99% of the chemical reaction will be (log 2 = 0.301):

  1. 460.6 minutes

  2. 230.3 minutes

  3. 23.03 minutes

  4. 46.06 minutes

Sol:
  

Answer : (4)

Q. 7. Copper crystallises in fcc with a unit cell length of 361 pm. What is the radius of copper atom?

  1. 181 pm

  2. 108 pm

  3. 127 pm

  4. 157 pm

Sol:

Answer : (3)

Q. 8. Given The value of standard electrode potential for the change,

  1. -0.270 V

  2. –0.072 V

  3. (3) 0.385 V

  4. (4) 0.770 V

Sol:

Answer : (4)