Thermodynamics Test

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Thermodynamics Test - 45

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following concepts is (are) wrong?

A
If for $$A\rightarrow B \,\, \Delta H=+q\ cal$$
then for, $$B\rightarrow A \,\, \Delta H=-q\ cal$$

B
If for $$A\rightleftharpoons B$$ eqb. constant $$=K$$
then for $$B\rightleftharpoons A$$ eqb. constant $$=\dfrac{1}{K}$$

C
If for $$A\rightarrow B$$ rate constant $$=k$$
then for $$B\rightarrow A$$ rate constant $$\neq k$$

D
If for $$A\rightarrow B$$ energy of activation $$=E$$
then for $$B\rightarrow A$$ energy of activation $$=-E$$

Solution

Out of all the options the option D is incorrect as the forward activation energy is not equal to backward activation energy, also the graph plot of both the energies are different.
Question 2
1 / -0

Which one of the following process is non-spontaneous?

A
Dissolution of $$CuSO_{4}$$ in water

B
Reaction of $$H_{2}$$ and $$O_{2}$$ to form water

C
Water flowing down hill

D
Flow of electric current from low potential to high potential

Solution

The physical or chemical processes which do not proceed by its own in a particular direction and requires outside help is called a non-spontaneous process. Therefore, flow of heat from a cold body to a hot body is a non-spontaneous process as it requires external work as per Clausius

Hence D is correct answer
Question 3
1 / -0

The law formulated by Dr. Nernst is:

A
First law of thermodynamics

B
Second law of thermodynamics

C
Third law of thermodynamics

D
Both (a) and (b)

Solution

The Nernst heat theorem was formulated by Walther Nernst early in the twentieth century and was used in the development of the third law of thermodynamics

Hen C is correct answer
Question 4
1 / -0

Which of the following endothermic processes are spontaneous?

A
Melting of ice

B
Evaporation of water

C
Heat of combustion

D
Both (a) and (b)

Solution

The reaction of baking soda with other acids, like hydrochloric acid, is also endothermic

Melting of ice and Evaporation of water is show endothermic process
Question 5
1 / -0

Which of the following expressions represents the first law of thermodynamics?

A
$$\Delta E=-q+W$$

B
$$\Delta E=q-W$$

C
$$\Delta E=q+W$$

D
$$\Delta E=-q-W$$

Solution

$$\Delta E=q+W$$

Option C.
Question 6
1 / -0

A minus sign of the free energy change denotes that:

A
The reaction tends to proceed spontaneously

B
The reaction is non spontaneous

C
The system is in equilibrium

D
The reaction is very much unlikely

Solution

When the free energy change is less than zero which means negative, the reaction is spontaneous
Question 7
1 / -0

Which of the following is the correct equation?

A
$$\Delta U=\Delta Q-W$$

B
$$\Delta W=\Delta U+\Delta Q$$

C
$$\Delta U=\Delta W+\Delta Q$$

D
None of these

Solution

$$\Delta U=\Delta W+\Delta Q$$
C is correct
Question 8
1 / -0

Which of the following
statements is correct?

A
The presence of reacting species in a covered beaker is an example of open system.

B
There is an exchange of energy as well as matter between the system and the surroundings in a closed system.

C
The presence of reactants in a closed vessel made up of copper is an example of a closed system.

D
The presence of reactants in a thermos flask or any other closed insulated vessel is an example of a closed system.

Solution

The presence
of reactants in a closed vessel made of conducting material e.g. copper or
steel is an example of a closed system.
Question 9
1 / -0

The reaction between $$\Delta G$$ and $$\Delta H$$ is:

A
$$\Delta H=\Delta G+T\Delta S$$

B
$$\Delta G=\Delta H-T\Delta S$$

C
$$T\Delta S-\Delta G=\Delta H$$

D
$$\Delta H=T\Delta G+\Delta S$$

Solution

The relation between change in Gibbs free energy and change in enthalpy is -

$$\Delta G= \Delta H- T\Delta S$$

Option B is correct.
Question 10
1 / -0

Which relation is correct for isochoric process

A
$$\Delta Q=\Delta U$$

B
$$\Delta W=\Delta U$$

C
$$\Delta Q=\Delta W$$

D
None of these

Solution

For isochoric process $$\Delta V=0\Rightarrow \Delta W=0$$ From FLOT $$\Delta Q=\Delta U+\Delta W\Rightarrow \Delta Q=\Delta U$$

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Thermodynamics Test - 45

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Question 1

If for $$A\rightarrow B \,\, \Delta H=+q\ cal$$then for, $$B\rightarrow A \,\, \Delta H=-q\ cal$$

If for $$A\rightleftharpoons B$$ eqb. constant $$=K$$then for $$B\rightleftharpoons A$$ eqb. constant $$=\dfrac{1}{K}$$

If for $$A\rightarrow B$$ rate constant $$=k$$then for $$B\rightarrow A$$ rate constant $$\neq k$$

If for $$A\rightarrow B$$ energy of activation $$=E$$then for $$B\rightarrow A$$ energy of activation $$=-E$$

Solution

Question 2

Dissolution of $$CuSO_{4}$$ in water

Reaction of $$H_{2}$$ and $$O_{2}$$ to form water

Water flowing down hill

Flow of electric current from low potential to high potential

Solution

Question 3

First law of thermodynamics

Second law of thermodynamics

Third law of thermodynamics

Both (a) and (b)

Solution

Question 4

Melting of ice

Evaporation of water

Heat of combustion

Both (a) and (b)

Solution

Question 5

$$\Delta E=-q+W$$

$$\Delta E=q-W$$

$$\Delta E=q+W$$

$$\Delta E=-q-W$$

Solution

Question 6

The reaction tends to proceed spontaneously

The reaction is non spontaneous

The system is in equilibrium

The reaction is very much unlikely

Solution

Question 7

$$\Delta U=\Delta Q-W$$

$$\Delta W=\Delta U+\Delta Q$$

$$\Delta U=\Delta W+\Delta Q$$

None of these

Solution

Question 8

The presence of reacting species in a covered beaker is an example of open system.

There is an exchange of energy as well as matter between the system and the surroundings in a closed system.

The presence of reactants in a closed vessel made up of copper is an example of a closed system.

The presence of reactants in a thermos flask or any other closed insulated vessel is an example of a closed system.

Solution

Question 9

$$\Delta H=\Delta G+T\Delta S$$

$$\Delta G=\Delta H-T\Delta S$$

$$T\Delta S-\Delta G=\Delta H$$

$$\Delta H=T\Delta G+\Delta S$$

Solution

Question 10

$$\Delta Q=\Delta U$$

$$\Delta W=\Delta U$$

$$\Delta Q=\Delta W$$

None of these

Solution

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If for $$A\rightarrow B \,\, \Delta H=+q\ cal$$
then for, $$B\rightarrow A \,\, \Delta H=-q\ cal$$

If for $$A\rightleftharpoons B$$ eqb. constant $$=K$$
then for $$B\rightleftharpoons A$$ eqb. constant $$=\dfrac{1}{K}$$

If for $$A\rightarrow B$$ rate constant $$=k$$
then for $$B\rightarrow A$$ rate constant $$\neq k$$

If for $$A\rightarrow B$$ energy of activation $$=E$$
then for $$B\rightarrow A$$ energy of activation $$=-E$$