This is a bit of a trick question! Here's why:

* Liquid is a state of matter, not a measurement of volume. Both 750ml and 1.5L are volumes, and both represent liquid amounts.

* 1.5L is a larger volume than 750ml. This means there's more liquid in a 1.5L container.

So, while neither is "more liquid" in terms of the state of matter, 1.5L contains more liquid than 750ml.