In the first law of thermodynamics, $dQ=dU+PdV$ :

$dQ=dU+PdV$

$dQ$  is an extensive quantity as it depends on the mass of the body but it is not a state variable.

$dU$  is an extensive state variable or physical quantity.

$PdV$ is the product of intensive (pressure) and extensive (volume) state variables which result in an extensive physical quantity but resulting quantity is not a state variable.