The unit of inductance is

zero

Power is dissipated only in the Resistor. Capacitor and Inductor only stores energy. So the power dissipation of a pure inductor is Zero.

voltage leads the current

On passing A.C. through an inductor voltage leads the current.

increases

The magnitude of inductance increases with an increase in the frequency.

1

For the purely resistive circuit, the power factor is 1 (perfect), because the reactive power equals zero.