AIEEE 2007 | Thermodynamics Question 179 | Chemistry

An ideal gas is allowed to expand both reversibly and irreversibly in an isolated system. If T_i is the initial temperature and T_f is the final temperature, which of the following statements is correct?

(T_f)_irrev > (T_f)_rev

(T_f)_rev = (T_f)_irrev

T_f > T_i for reversible process but T_f = T_i for irreversible process

T_f = T_i for both reversible and irreversible processes

AIEEE 2006

MCQ (Single Correct Answer)

-1

($$\Delta H - \Delta U$$) for the formation of carbon monoxide (CO) from its elements at 298 K is : (R = 8.314 J K^–1 mol^–1)

–1238.78 J mol^–1

1238.78 J mol^–1

–2477.57 J mol^–1

2477.57 J mol^–1

AIEEE 2006

MCQ (Single Correct Answer)

-1

The standard enthalpy of formation $$\Delta _fH^o$$ at 298 K for methane, CH₄(g), is –74.8 kJ mol^–1. The additional information required to determine the average energy for C – H bond formation would be :

the dissociation energy of H₂ and enthalpy of sublimation of carbon

latent heat of vapourization of methane

the first four ionization energies of carbon and electron gain enthalpy of hydrogen

the dissociation energy of hydrogen molecule, H₂

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