Thermodynamics · Chemistry · AP EAPCET

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MCQ (Single Correct Answer)

1
What is the ratio of kinetic energies of 3 g of hydrogen and 4 g of oxygen at a certain temperature?
AP EAPCET 2024 - 20th May Evening Shift
2
The volume of an ideal gas contracts from 10.0 L to 2.0 L under an applied pressure of 2.0 atm . During contraction the system also evolved 900 J of heat. The change in internal energy (in J ) involved in the system is ( $1 \mathrm{~L} \mathrm{~atm}=101.3 \mathrm{~J}$ )
AP EAPCET 2024 - 20th May Evening Shift
3
The molar heat of fusion and vaporisation of benzene are 10.9 and $31.0 \mathrm{~kJ} \mathrm{~mol}^{-1}$ respectively. The changes in entropy for the solid $\rightarrow$ liquid and liquid $\rightarrow$ vapour trasitions for benzene are $x$ and $y, \mathrm{JK}^{-1} \mathrm{~mol}^{-1}$, respectively. The value of $(y-x)$ (in $\mathrm{J} \mathrm{K}^{-1} \mathrm{~mol}^{-1}$ ) is (At 1 atm benzene melts at $5.5^{\circ} \mathrm{C}$ and boils at $80^{\circ} \mathrm{C}$ )
AP EAPCET 2024 - 20th May Evening Shift
4

Observe the following reaction,

$$ 2 A_2(g)+B_2(g) \xrightarrow{T(\mathrm{~K})} 2 A_2 B(g)+600 \mathrm{~kJ} $$

The standard enthalpy of formation $\left(\Delta_f H^{\ominus}\right)$ of $A_2 B(g)$ is

AP EAPCET 2024 - 20th May Morning Shift
5
Identify the molecule for which the enthalpy of atomisation ( $\Delta_a H^{\ominus}$ ) and bond dissociation enthalpy $\left(\Delta_{\text {bond }} H^{\ominus}\right)$ are not equal
AP EAPCET 2024 - 20th May Morning Shift
6

Given below are two statements :

Statement I For isothermal irreversible change of an ideal gas, $q=-w=p_{\text {ext }}\left(V_{\text {final }}-V_{\text {initial }}\right)$

Statement II For adiabatic change, $\Delta U=w_{\text {adiabatic }}$

The correct answer is :

AP EAPCET 2024 - 19th May Evening Shift
7
A thermodynamic process $(B \rightarrow E)$ was completed as shown below. The work done is equal to area under the limits AP EAPCET 2024 - 19th May Evening Shift Chemistry - Thermodynamics Question 8 English
AP EAPCET 2024 - 19th May Evening Shift
8
At 300 K for the reaction. $A \rightarrow P$. The $\Delta S_p$ is $5 \mathrm{JK}^{-1} \mathrm{~mol}^{-1}$, What is the heat absorbed (in kJ $\mathrm{mol}^{-1}$ ) by the system?
AP EAPCET 2024 - 18th May Morning Shift
9

Identify the incorrect statements form the following.

I. $ \Delta S_{\text {pum }}=\left(\Delta S_{\text {nal }}+\Delta S_{\text {um }}\right) $

II. $A(\bar{i} \rightarrow A(\phi)$ : For this process entropy change decreases.

III. Entropy units are $\mathrm{JK} \mathrm{mol}^{-1}$.

AP EAPCET 2024 - 18th May Morning Shift
10

Identify the correct statements from the following.

I. At 0 K , the entropy of pure crystalline materials approach zero.

II. Entropy for the process, $$\mathrm{H}_2 \mathrm{O}(\mathrm{l}) \longrightarrow \mathrm{H}_2 \mathrm{O}(\mathrm{g})$$ decreases.

III. Gibb's energy is a state function.

AP EAPCET 2022 - 5th July Morning Shift
11

Use the data from table to estimate the enthalpy of formation of $$\mathrm{CH}_3 \mathrm{CHO}$$.

Bond enthalpy Bond Enthalpy of formation
$$\mathrm{400~kJ~mol^{-1}}$$ $$\mathrm{C-H}$$ $$\mathrm{C}(\mathrm{g}) 700 \mathrm{~kJ} \mathrm{~mol}^{-1}$$
$$\mathrm{350~kJ~mol^{-1}}$$ $$\mathrm{C-C}$$ $$\mathrm{H}(\mathrm{g}) 200 \mathrm{~kJ} \mathrm{~mol}^{-1}$$
$$\mathrm{700~kJ~mol^{-1}}$$ $$\mathrm{C=O}$$ $$\mathrm{O}(\mathrm{g}) 250 \mathrm{~kJ} \mathrm{~mol}^{-1}$$

AP EAPCET 2022 - 5th July Morning Shift
12

From the following plots, find the correct option.

AP EAPCET 2022 - 4th July Evening Shift Chemistry - Thermodynamics Question 12 English

AP EAPCET 2022 - 4th July Evening Shift
13

Observe the following properties : Volume, enthalpy, density, temperature, heat capacity, pressure and internal energy. The number of extensive properties in the above list is

AP EAPCET 2022 - 4th July Evening Shift
14

Match the following.

A. Isothermal process i. $$
q=\Delta U
$$
B. Adiabatic process ii. $$
W=-p \times \Delta V
$$
C. Isobaric process iii. $$
W=\Delta U
$$
D. Isochoric process iv. $$
W=-n R T \ln \left(\frac{V_t}{V_i}\right)
$$

AP EAPCET 2022 - 4th July Evening Shift
15

Which of the following expression is correct?

AP EAPCET 2022 - 4th July Evening Shift
16

Identify the reaction/process in which the entropy increases.

AP EAPCET 2022 - 4th July Morning Shift
17

State $$1 \rightleftharpoons$$ State $$2 \rightleftharpoons$$ State 3 $$\left(\begin{array}{l}T=300 \mathrm{~K} \\ p=15 \mathrm{bar} \\ 1 \mathrm{~mol}\end{array}\right)\left(\begin{array}{l}T=300 \mathrm{~K} \\ p=10 \mathrm{bar} \\ 1 \mathrm{~mol}\end{array}\right)\left(\begin{array}{l}T=300 \mathrm{~K} \\ p=5 \mathrm{bar} \\ 1 \mathrm{~mol}\end{array}\right)$$

Above shows a cyclic process. Calculate the total work done during one complete cycle. [Assume a single step to reach the next state].

AP EAPCET 2022 - 4th July Morning Shift
18

For the reaction, $$\mathrm{H}_2 \mathrm{O}(l) \longrightarrow \mathrm{H}_2 \mathrm{O}(\mathrm{g})$$ at $$T=100^{\circ} \mathrm{C}$$ and $$p=1 \mathrm{~atm}$$, choose the correct option.

AP EAPCET 2021 - 20th August Morning Shift
19

Two flasks $$A$$ and $$B$$ have equal volumes. $$A$$ is maintained at $$300 \mathrm{~K}$$ and $$B$$ at $$600 \mathrm{~K}$$. Equal masses of $$\mathrm{H}_2$$ and $$\mathrm{CO}_2$$ are taken in flasks $$A$$ and $$B$$ respectively. Find the ratio of total KE of gases in flask $$A$$ to that of $$B$$.

AP EAPCET 2021 - 19th August Evening Shift
20

When the temperature of 2 moles of an ideal gas is increased by 20$$^\circ$$C at constant pressure. Find the work involved in the process.

AP EAPCET 2021 - 19th August Evening Shift
21

If a chemical reaction is known to be non-spontaneous at 298 K but spontaneous at 350 K, then which among the following conditions is true for the reaction?

AP EAPCET 2021 - 19th August Morning Shift
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