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

For which of the following reactions is $\Delta U = \Delta H$?

What is the enthalpy change (in $J$) for converting $9 \ g$ of $H_2O(l)$ at $+10^{\circ}C$ to $H_2O(l)$ at $+20^{\circ}C$? $(C_p(H_2O(l)) = 75 \ J \ mol^{-1} \ K^{-1})$

Which of the following is not a state function of a thermodynamic system?

Find the work done $W_{ABC}$ for the process $A$ $\rightarrow B$ $\rightarrow C$ in $L \cdot atm$.

$X$ is an extensive property and $x$ is an intensive property of a thermodynamic system. Which of the following statement$(s)$ is (are) correct?