Question

2 points

The given graph shows the heating curve for a pure substance. The temperature rises with time as the substance is heated : 


which portion of the graph indicates the change of state occuring?

A1 TO B2

D1 TO D2

A1 TO D2

D2 TO B1​

Answer 1

Answer:

(a) At point A : The substance is in the solid state. <br> At point B : The substance has started melting. It exists both in the solid and liquid states. <br> At point C : The substance is in the liquid state. <br> A point D : The substance has started boiling. It exists both in the liquid and gaseous states. <br> (b) the melting point of the substance is

. <br> (c ) The boiling point of the substance is

. <br> (d) The temperature remains the same during the change of state. <br> (e ) Had substance been water, its melting point should have been

and boiling point