MHT CET 2022 11th August Evening Shift | Thermodynamics Question 38 | Chemistry

If $$\mathrm{Q}$$ is the heat liberated from the system and $$\mathrm{W}$$ is the work done on the system then first law of thermodynamics can be written as,

$$\mathrm{Q}=\mathrm{W}-\Delta \mathrm{U}$$

$$\mathrm{Q}=\Delta \mathrm{U}-\mathrm{W}$$

$$\mathrm{Q}=\Delta \mathrm{U}+\mathrm{W}$$

$$\mathrm{Q}=-\mathrm{W}$$

MHT CET 2021 22th September Evening Shift

MCQ (Single Correct Answer)

-0

Formation of $$\mathrm{NO}_{2(\mathrm{g})}$$ from $$\mathrm{N}_{2(\mathrm{g})}$$ and $$\mathrm{O}_{2(\mathrm{g})}$$ is an endothermic process. Which of the following is true for this reaction?

$$\Delta \mathrm{H}=0$$

$$\Delta \mathrm{H}<0$$

$$\Delta \mathrm{H}=\Delta \mathrm{U}$$

$$\Delta \mathrm{H}>0$$

MHT CET 2021 22th September Evening Shift

MCQ (Single Correct Answer)

-0

What is enthalpy of formation of $$\mathrm{NH}_3$$ if bond enthalpies are as $$(\mathrm{N} \equiv \mathrm{N})=941 \mathrm{~kJ},(\mathrm{H}-\mathrm{H})=436 \mathrm{~kJ},(\mathrm{N}-\mathrm{H})=389 \mathrm{~kJ}$$ ?

$$-84.5 \mathrm{~kJ}$$

$$-21.25 \mathrm{~kJ}$$

$$-42.5 \mathrm{~kJ}$$

$$-63.45 \mathrm{~kJ}$$

MHT CET 2021 22th September Evening Shift

MCQ (Single Correct Answer)

-0

What is the difference between $$\Delta H$$ and $$\Delta \mathrm{U}$$ for reaction given below at $$298 \mathrm{~K}$$ ?

($$\mathrm{R}=8.314 \mathrm{JK}^{-1} \mathrm{~mol}^{-1}$$

$$2 \mathrm{C}_6 \mathrm{H}_{6(\ell)}+15 \mathrm{O}_{2(\mathrm{~g})} \rightarrow 12 \mathrm{CO}_{2(\mathrm{~g})}+6 \mathrm{H}_2 \mathrm{O}_{(\ell)}$$

$$-2.72 \mathrm{~kJ}$$

$$-7.43 \mathrm{~kJ}$$

$$-7.8 \mathrm{~kJ}$$

$$-3.72 \mathrm{~kJ}$$

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