Which of the following are not state functions?
$I$. $q + w$
$II$. $q$
$III$. $w$
$IV$. $H - TS$

$A$ well-stoppered thermos flask contains some ice cubes. This is an example of a

The work done in an isothermal reversible process for an ideal gas is-

Which of the following is always negative for an exothermic reaction?

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?

In an endothermic reaction,the value of the change in enthalpy $(\Delta H)$ is