AIEEE 2006 | Thermodynamics Question 218 | 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 2005

MCQ (Single Correct Answer)

-1

Consider the reaction: N₂ + 3H₂ $$\to$$ 2NH₃ carried out at constant temperature and pressure. If $$\Delta H$$ and $$\Delta U$$ are the enthalpy and internal energy changes for the reaction, which of the following expressions is true?

$$\Delta H$$ > $$\Delta U$$

$$\Delta H$$ < $$\Delta U$$

$$\Delta H$$ = $$\Delta U$$

$$\Delta H$$ = 0

AIEEE 2005

MCQ (Single Correct Answer)

-1

Consider an endothermic reaction, X $$\to$$ Y with the activation energies E_b and E_f for the backward and forward reactions, respectively. In general :

E_b < E_f

E_b > E_f

E_b = E_f

There is no definite relation between E_b and E_f

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