can an Xbox series x/s work on 75hz HDMI 1.4 gaming monitor?

Yes, an Xbox Series X/S can work with a 75Hz HDMI 1.4 gaming monitor. The Xbox Series X/S supports HDMI 2.1, which is backward compatible with HDMI 1.4 and other previous versions. However, you won't be able to take advantage of the full capabilities of HDMI 2.1, such as 4K resolution at 120Hz or Variable Refresh Rate (VRR), since HDMI 1.4 is limited to 60Hz at 4K resolution. Nevertheless, you can still enjoy gaming on your Xbox Series X/S with a 75Hz refresh rate on the monitor.