AP EAPCET 2024 - 18th May Morning Shift | Thermodynamics Question 39 | Chemistry

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?

1.5

1500

0.6

AP EAPCET 2024 - 18th May Morning Shift

MCQ (Single Correct Answer)

-0

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 $\mathrm{JK} \mathrm{mol}^{-1}$.

1,18 only

1,11 only

L, II, Ill only

II, III anly

AP EAPCET 2022 - 5th July Morning Shift

MCQ (Single Correct Answer)

-0

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.

I, II, III

I, III

II, III

I, II

AP EAPCET 2022 - 5th July Morning Shift

MCQ (Single Correct Answer)

-0

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

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

$$-200$$ kJ mol$$^{-1}$$

$$-400$$ kJ mol$$^{-1}$$

$$-350$$ kJ mol$$^{-1}$$

$$-150$$ kJ mol$$^{-1}$$

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