The graph alogside showsthe heating curve for a pure substance. The temperature rises with time as the substance is heated : What is the physical state of the substance at the point A,B,C and D? What is the melting point of the substance ? What is its boiling point ? What happens to the temperature while the substance is chaging state ? The substace is not wter. how can you judge from the graph ?

The graph alogside showsthe heating curve for a pure substance. The te

1.	The graph alogside showsthe heating curve for a pure substance. The temperature rises with time as the substance is heated : What is the physical state of the substance at the point A,B,C and D? What is the melting point of the substance ? What is its boiling point ? What happens to the temperature while the substance is chaging state ? The substace is not wter. how can you judge from the graph ?
Answer» SOLUTION : (a)At point A : The substancve is in the solid STATE. At point B : The SUBSTANCE has started has started melting. It exists both in the solid and liquid states. At point C : The substace is in the liquid state. At point D : The substance has started boiling. It exists both in the liquid and gaseous states. (b) The melting point of the substance is `15^(@)C`. (c) The melting point of the substance is `110^(@)C`. (d) The temperature remains the same during the chage of state. (e) Had substance been wagter, its melting point should have been `0^(@)C` and boiling point `100^(@)C`. It is therefore,not water.