AP EAPCET 2022 - 5th July Morning Shift | AP EAPCET Year Wise Previous Years Questions

50 g of a substance is dissolved in 1 kg of water at $$+90^{\circ} \mathrm{C}$$. The temperature is reduced to $$+10^{\circ} \mathrm{C}$$. The density is increased from 1.1 to $$1.15 \mathrm{~g} \mathrm{~cc}^{-1}$$. What is the % change of molarity of the solution?

4.5

7.3

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$$^{-1}$$

PREVIOUS NEXT