AP EAPCET 2024 - 21th May Morning Shift | Thermodynamics Question 1 | Chemistry

Identify the correct statements from the following. I. $\Delta_r G$ is zero for $A \rightleftharpoons B$ reaction. II. The entropy of pure crystalline solids approaches. zero as the temperature approaches absolute zero. III. $\Delta U$ of a reaction can be determined using bomb calorimeter.

I, II only

I, III only

II, III only

I, II, III

AP EAPCET 2024 - 21th May Morning Shift

MCQ (Single Correct Answer)

-0

Observe the following reactions.

$$ \begin{array}{ll} A B(g)+25 \mathrm{H}_2 \mathrm{O}(l) \longrightarrow\left(25 \mathrm{H}_2 \mathrm{O}\right) A B ; & \Delta H=x \mathrm{~kJ} \mathrm{~mol}^{-1} \\ A B(g)+50 \mathrm{H}_2 \mathrm{O}(l) \longrightarrow\left(50 \mathrm{H}_2 \mathrm{O}\right) A B ; & \Delta H=y \mathrm{~kJ} \mathrm{~mol}^{-1} \end{array} $$

$(y-x)$

$(y+x)$

$\frac{y}{x}$

$\frac{x}{y}$

AP EAPCET 2024 - 21th May Morning Shift

MCQ (Single Correct Answer)

-0

The equation that represents 'coal gasification' is

$\mathrm{CO}(\mathrm{g})+\mathrm{H}_2 \mathrm{O}(\mathrm{g}) \frac{673 \mathrm{~K}}{\text { catalyst }} \mathrm{CO}_2(\mathrm{~g})+\mathrm{H}_2(\mathrm{~g})$

$\mathrm{C}(\mathrm{s})+\mathrm{H}_2 \mathrm{O}(\mathrm{g}) \xrightarrow{1270 \mathrm{~K}} \mathrm{CO}(\mathrm{g})+\mathrm{H}_2(\mathrm{~g})$

$2 \mathrm{C}(\mathrm{s})+\mathrm{O}_2(g)+4 \mathrm{~N}_2(g) \xrightarrow{1273 \mathrm{~K}} 2 \mathrm{CO}(g)+4 \mathrm{~N}_2(g)$

$\mathrm{CH}_4(g)+\mathrm{H}_2 \mathrm{O}(\mathrm{g}) \xrightarrow[\mathrm{Ni}]{1270 \mathrm{~K}} \mathrm{CO}(\mathrm{g})+3 \mathrm{H}_2(\mathrm{~g})$

AP EAPCET 2024 - 21th May Morning Shift

MCQ (Single Correct Answer)

-0

The standard free energy change $\left(\Delta G^{\circ}\right)$ for the following reaction (in kJ ) at $25^{\circ} \mathrm{C}$ is $$ 3 \mathrm{Ca}(s)+2 \mathrm{Au}^{3+}(a q, 1 M) \longrightarrow 3 \mathrm{Ca}^{2+}(a q, 1 M)+2 \mathrm{Au}(s) $$

$-2.53 \times 10^3$

$+2.53 \times 10^3$

$-2.53 \times 10^4$

$+2.53 \times 10^4$

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