a. consists any one phase among solid, liquid and gas
b. consists only solid phase not liquid and gas
c. consists all three phases at particular temperature
d. none of the above
Correct Answer : a. consists any one phase among solid, liquid and gas
A quantity of matter homogeneous throughout in chemical composition and physical structure is called as a phase. Every substance can exist in any one or more of three phases like solid, liquid or gas. A system consisting of a single phase is called as homogeneous system, and a substance which consists of more than one phase is called as heterogeneous.