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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
18
MCQ (Multiple Correct Answer)

For an ideal gas, the work of reversible expansion under isothermal condition can be calculated by using the expression $W=-n R T \ln \frac{V_f}{V_i}$. A sample containing 1.0 mol of an ideal gas is expanded isothermally and reversible to ten times of its original volume, in two separate experiments. The expansion is carried out at 300 K and at 600 K respectively. Choose the correct option.

A
Work done at 600 K is 20 times the work done at 300 K
B
Work done at 300 K is twice the work done at 600 K
C
Work done at 600 K is twice the work done at 300 K
D
$\Delta U=0$ in both cases
19
MCQ (Multiple Correct Answer)

Consider the following reaction between zinc and oxygen and choose the correct options out of the options given below

$$2 \mathrm{Zn}(s)+\mathrm{O}_2(g) \rightarrow 2 \mathrm{ZnO}(s) ; \Delta H=-693.8 \mathrm{~kJ} \mathrm{~mol}^{-1}$$

A
The enthalpy of two moles of ZnO is less than the total enthalpy of two moles of Zn and one mole of oxygen by 693.8 kJ
B
The enthalpy of two moles of ZnO is more than the total enthalpy of two moles of Zn and one mole of oxygen by 693.8 kJ
C
$693.8 \mathrm{~kJ} \mathrm{~mol}^{-1}$ energy is evolved in the reaction
D
$693.8 \mathrm{~kJ} \mathrm{~mol}^{-1}$ energy is absorbed in the reaction
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