Conditions of standard state used in thermochemistry is

For one mole of an ideal gas,which of these statements must be true?
$(a)$ $U$ and $H$ each depend only on temperature.
$(b)$ Compressibility factor $Z$ is not equal to $1$.
$(c)$ $C_{P,m} - C_{V,m} = R$
$(d)$ $dU = C_V dT$ for any process.

Which one of the following reactions has $\Delta H = \Delta U$?

Choose the reaction in which $\Delta H$ is not equal to $\Delta U$.

For the reaction,$2Cl_{(g)} \to Cl_{2_{(g)}}$,what are the signs of $\Delta H$ and $\Delta S$?

For which of the following reactions is $\Delta H$ approximately equal to $\Delta E$?