Can a purely reactive element exhibit resistive properties?
By way of illustration, let \$\small R=1; X_L=1\$, hence the series connection is: \$\small Z=1+j\$.



Now, this series connection of \$\small 1\$ and \$\small j1\$ is equivalent to a parallel connection of \$\small 2\$ and \$\small j2\$, \$\small \left(=\frac{j4}{2+j2}=1+j\right)\$, 



hence place an additional capacitive reactance of \$\small -j2\$ in parallel and the overall load across the source (i.e. the load that the source sees) is \$\small 2\Omega \$ resistive.



Thus, the power factor is unity but the effective resistance seen by the source is \$\small 2\Omega \$, hence the power [W] transferred to the load is less than would be the case if the true resistive load were connected directly to the source.