MHT CET 2023 9th May Evening Shift | Thermodynamics Question 81 | Chemistry

An ideal gas expands by $$1.5 \mathrm{~L}$$ against a constant external pressure of $$2 \mathrm{~atm}$$ at $$298 \mathrm{~K}$$. Calculate the work done?

$$-75 \mathrm{~J}$$

$$-303.9 \mathrm{~J}$$

$$13.3 \mathrm{~J}$$

$$-30 \mathrm{~J}$$

MHT CET 2023 9th May Morning Shift

MCQ (Single Correct Answer)

-0

Which among the following reactions exhibits $$\Delta \mathrm{H}=\Delta \mathrm{U}$$ ?

$$\mathrm{H}_{2(\mathrm{~g})}+\mathrm{Br}_{2(\mathrm{~g})} \rightarrow 2 \mathrm{HBr}_{(\mathrm{g})}$$

$$2 \mathrm{CO}_{(\mathrm{g})}+\mathrm{O}_{2(\mathrm{~g})} \rightarrow 2 \mathrm{CO}_{2(\mathrm{~g})}$$

$$\mathrm{PCl}_{5(\mathrm{~g})} \rightarrow \mathrm{PCl}_{3(\mathrm{~g})}+\mathrm{Cl}_{2(\mathrm{~g})}$$

$$\mathrm{C}_{(\mathrm{s})}+2 \mathrm{H}_2 \mathrm{O}_{(\mathrm{g})} \rightarrow 2 \mathrm{H}_{2(\mathrm{~g})}+\mathrm{CO}_{2(\mathrm{~g})}$$

MHT CET 2023 9th May Morning Shift

MCQ (Single Correct Answer)

-0

An ideal gas expands by performing $$200 \mathrm{~J}$$ of work, during this internal energy increases by $$432 \mathrm{~J}$$. What is enthalpy change?

$$200 \mathrm{~J}$$

$$232 \mathrm{~J}$$

$$432 \mathrm{~J}$$

$$632 \mathrm{~J}$$

MHT CET 2023 9th May Morning Shift

MCQ (Single Correct Answer)

-0

Calculate the value of $$\Delta G$$ for following reaction at $$300 \mathrm{~K}$$.

$$\begin{aligned} & \mathrm{H}_2 \mathrm{O}_{(\mathrm{s})} \longrightarrow \mathrm{H}_2 \mathrm{O}_{(l)} \\ & \left(\Delta \mathrm{H}=7 \mathrm{~kJ}, \Delta \mathrm{S}=24.8 \mathrm{~J} \mathrm{~K}^{-1}\right) \end{aligned}$$

$$0.74 \mathrm{~kJ} \mathrm{~mol}^{-1}$$

$$-0.82 \mathrm{~kJ} \mathrm{~mol}^{-1}$$

$$0.21 \mathrm{~kJ} \mathrm{~mol}^{-1}$$

$$-0.44 \mathrm{~kJ} \mathrm{~mol}^{-1}$$

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