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Question

The incorrect statements among the following
  1. Enthalpy of neutralization of formic acid vs NaOH is greater than enthalpy of neutralization of acetic acid
  2. Heat capacity of O2 is independent of temperature
  3. Boiling of water at 374 K is an equilibrium process
  4. For the same volume change workdone in adiabatic compression is greater than reversible isothermal compression


Solution

The correct options are
B Heat capacity of O2 is independent of temperature
C Boiling of water at 374 K is an equilibrium process
a) Since formic acid is a stronger acid than acetic acid, enthalpy of neutralization will be greater.

b) For di and polyatomic molecules, vibrational degrees of freedom contribute to heat capacity at higher temperature.

c) Boiling of water at 374 K is a spontaenous process. At this temperature ΔH>TΔS

d) P1V1=P2V2 for isothermal reversible compression
P1Vγ1=P3Vγ2 for adiabatic compression.

V1Vγ2Vγ1V2=P2P3

Since V1 is greater than V2 and γ is greater than 1, P2 is less than P3. Hence more work is done in adiabatic compression.
 

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