MHT CET 2021 23th September Morning Shift | Thermodynamics Question 143 | Chemistry

A system gives out $$\mathrm{x} \mathrm{~J}$$ of heat and does $$\mathrm{y} \mathrm{~J}$$ of work on it's surrounding. What is the internal energy change?

$$\mathrm{-x-y ~J}$$

$$\mathrm{y-x ~J}$$

$$\mathrm{x-y ~J}$$

$$\mathrm{x+y}$$ J

MHT CET 2021 23th September Morning Shift

MCQ (Single Correct Answer)

-0

A system does 394 J of work on surrounding by absorbing 701 J heat. What is the change in internal energy of the system?

547 J

1095 J

307 J

394 J

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 $$(\mathrm{N} \equiv \mathrm{N})=941 \mathrm{~kJ},(\mathrm{H}-\mathrm{H})=436 \mathrm{~kJ},(\mathrm{N}-\mathrm{H})=389 \mathrm{~kJ}$$ ?

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

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

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

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

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