what state of matter is x? solid gas supercritical fluid liquid

Brief Explanations:

States of matter include solid, gas, super - critical fluid, and liquid. Without more context about what 'X' is or details from the phase diagram shown, we can't be certain. But based on common knowledge and the options provided, we need to analyze the characteristics of each state. A solid has a definite shape and volume, a gas has no definite shape or volume and fills its container, a supercritical fluid has properties between a gas and a liquid and exists above the critical point, and a liquid has a definite volume but takes the shape of its container.

Answer:

Insufficient information to determine.