Exothermic reactions occur in which of the following processes?

Heat exchanged in a chemical reaction at constant temperature and constant pressure is called as

What is meant by standard state in the context of the equation $\Delta U = q + w$?

One mole of an ideal gas at $300 \ K$ and $20 \ atm$ expands to $2 \ atm$ under isothermal and reversible conditions. The work done by the gas is $-x \ kJ \ mol^{-1}$. The value of $x$ is $(R = 8.3 \ J \ K^{-1} \ mol^{-1})$

Observe the following properties: Volume,enthalpy,density,temperature,heat capacity,pressure,internal energy. The number of extensive properties in the above list is

Out of molar entropy $(I)$,specific volume $(II)$,heat capacity $(III)$ and volume $(IV)$,which are extensive properties?