The diagram above is the heating curve for a solid, QR is the?
Attached Figure / Diagram
A
melting region
B
boiling region
C
sublimation region
D
evaporating process
Verified Correct Answer: A.
Physical Principles & Numerical Solution
At melting point there is no change temperature
Source: WAEC / JAMB / NECO Classroom Archive (Record #14488)