Which of the following is true for heat and temperature?

Which of the following is true for the value of $\Delta H - \Delta U$ at constant volume?

Explain the measurement of $\Delta U$ and $\Delta H$ by calorimetry.

In which of the following processes does the internal energy of a system remain constant?

Which of the following symbols represents the heat of reaction at constant volume?

Consider the following statements:
$(1)$ Joule-Thomson experiment is isoenthalpic as well as adiabatic.
$(2)$ $A$ negative value of $\mu_{JT}$ (Joule-Thomson coefficient) corresponds to warming of a gas on expansion.
$(3)$ The temperature at which neither cooling nor heating effect is observed is known as inversion temperature.
Which of the above statements are correct?