13
MCQ (Single Correct Answer)
Enthalpy of sublimation of a substance is equal to
A
enthalpy of fusion + enthalpy of vaporisation
B
enthalpy of fusion
C
enthalpy of vaporisation
D
twice the enthalpy of vaporisation
14
MCQ (Single Correct Answer)
Which of the following is not correct?
A
$\Delta G$ is zero for a reversible reaction.
B
$\Delta G$ is positive for a spontaneous reaction.
C
$\Delta G$ is negative for a spontaneous reaction.
D
$\Delta G$ is positive for a non-spontaneous reaction.
15
MCQ (Multiple Correct Answer)
Thermodynamics mainly deals with
A
interrelation of various forms of energy and their transformation from one form to another.
B
energy changes in the processes which depend only on initial and final states of the microscopic systems containing a few molecules.
C
how and at what rate these energy transformations are carried out.
D
the system in equilibrium state or moving from one equilibrium state to another equilibrium state.
16
MCQ (Multiple Correct Answer)
In an exothermic reaction, heat is evolved, and system loses heat to the surrounding. For such system
A
$q_p$ will be negative
B
$\Delta_r H$ will be negative
C
$q_p$ will be positive
D
$\Delta_r H$ will be positive
17
MCQ (Multiple Correct Answer)
The spontaneity means, having the potential to proceed without the assistance of external agency. The processes which occur spontaneously are
A
flow of heat from colder to warmer body
B
gas in a container contracting into one corner
C
gas expanding to fill the available volume
D
burning carbon in oxygen to give carbon dioxide