Thermodynamics Test

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Thermodynamics Test - 13

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following is the property of a system

A
pressure and temperature

B
internal energy

C
volume and density

D
all of the above

Solution

All the given quantities in the question, describe the state of system, therefore they are the properties of a system.
Question 2
1 / -0

Which heat depends on the direction of current?

A
Joule heat

B
Peltier heat

C
Thompson effect

D
None of these

Solution

In Peltier effect, heat loss and heat gain depends upon the direction of current. A typical Peltier heat pump involves multiple junction in series in which direction of current is important.
Question 3
1 / -0

Which of the following is not a thermodynamic coordinate?

A
Gas constant (R)

B
Pressure (P)

C
Volume (V)

D
Temperature (T)

Solution

R is a constant and is not a thermodynamic constant.
Question 4
1 / -0

Gas constant $$(R)$$ equals to

A
$$\dfrac{C_p}{C_v}$$

B
$$1$$

C
$$C_v-C_p$$

D
$$C_p-C_v$$

Solution

By Mayer's formula , we have
$$C_{P}-C_{V}=R$$
Where $$C_{P}$$ and $$C_{V}$$ are the molar specific heats of gas at constant pressure and constant volume respectively .
Question 5
1 / -0

$$C_v$$ for ammonia gas is $$(in J \ mol^{-1} \ K^{-1})$$

A
$$29.0$$

B
$$12.5$$

C
$$20.7$$

D
$$31.2$$

Solution

Heat capacity of ammonia at constant volume is $$29J mol^{-1}K^{-1}$$
Question 6
1 / -0

Mixture of ice and water is form a

A
closed system

B
open system

C
isolated system

D
heterogeneous system

Solution

Mixture of ice and water is a heterogeneous system because their chemical compositions are same but the physical properties are completely different.
Question 7
1 / -0

Free energy change for the process $$A(s)\rightleftharpoons B(l)$$ will be:

A
0

B
1

C
2

D
3

Solution

In the given process,
A and B are in equilibrium, and we know that the free energy change for equilibrium reaction is zero.
Question 8
1 / -0

A chemical reaction is spontaneous at 298 K but non-spontaneous at 350 K. Which one of the following is true for the reaction?

A
$$\Delta G\quad \Delta H\quad \Delta S\\ -\quad \quad -\quad \quad +$$

B
$$\Delta G\quad \Delta H\quad \Delta S\\ +\quad \quad +\quad \quad +$$

C
$$\Delta G\quad \Delta H\quad \Delta S\\ -\quad \quad +\quad \quad -$$

D
$$\Delta G\quad \Delta H\quad \Delta S\\ +\quad \quad -\quad \quad +$$

E
$$\Delta G\quad \Delta H\quad \Delta S\\ -\quad \quad -\quad \quad -$$

Solution
Question 9
1 / -0

The internal energy of compressed real gas, as compared to that of the ideal gas at the same temperature is

A
less

B
more

C
sometimes less, sometimes more

D
maximum

Solution

The internal energy of a gas is due to the energy possessed due to the motion of the molecular motion and configuration of molecules.

In case of an ideal gas, these molecular collisions and attraction are assumed to be absent as per the kinetic theory. Hence, in an ideal gas that is compressed, the gas molecules will not have potential energy but only kinetic energy. Hence, all ideal gases will have equal internal energy at same temperature.

In case of a real gas, the molecules possess both types of internal energies unlike an ideal gas. While compressing it the internal energy of the molecules is lost during the collisions within the molecules and with walls of the container. Hence compression at same temperature, internal energy(real gas) < internal energy(ideal gas)
Question 10
1 / -0

The internal energy of a perfect gas is :

A
completely kinetic

B
completely potential

C
sum of potential and kinetic energy of the molecules

D
difference of kinetic and potential energy of the molecules

Solution

In a perfect gas or an ideal gas, the atoms of molecules collide in a perfectly elastic manner. That is the intermolecular attractive forces are absent and thus the internal energy is completely kinetic.
Hence, option A is correct.

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Thermodynamics Test - 13

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Thermodynamics Test - 13

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SHARING IS CARING

Question 1

pressure and temperature

internal energy

volume and density

all of the above

Solution

Question 2

Joule heat

Peltier heat

Thompson effect

None of these

Solution

Question 3

Gas constant (R)

Pressure (P)

Volume (V)

Temperature (T)

Solution

Question 4

$$\dfrac{C_p}{C_v}$$

$$1$$

$$C_v-C_p$$

$$C_p-C_v$$

Solution

Question 5

$$29.0$$

$$12.5$$

$$20.7$$

$$31.2$$

Solution

Question 6

closed system

open system

isolated system

heterogeneous system

Solution

Question 7

0

1

2

3

Solution

Question 8

$$\Delta G\quad \Delta H\quad \Delta S\\ -\quad \quad -\quad \quad +$$

$$\Delta G\quad \Delta H\quad \Delta S\\ +\quad \quad +\quad \quad +$$

$$\Delta G\quad \Delta H\quad \Delta S\\ -\quad \quad +\quad \quad -$$

$$\Delta G\quad \Delta H\quad \Delta S\\ +\quad \quad -\quad \quad +$$

$$\Delta G\quad \Delta H\quad \Delta S\\ -\quad \quad -\quad \quad -$$

Solution

Question 9

less

more

sometimes less, sometimes more

maximum

Solution

Question 10

completely kinetic

completely potential

sum of potential and kinetic energy of the molecules

difference of kinetic and potential energy of the molecules

Solution

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