Gas Laws Questions

Assertion : Compressibility factor for hydrogen varies with pressure with positive slope at all pressures.Reason : Even at low pressures, repulsive forces dominate hydrogen gas.

Air bubble at $15^{\circ }\text{C}$ and $1.5\text{bar}$ rises to surface where it is $25^{\circ }\text{C}$ and $1.0\text{bar}$. The volume becomes: