Why does sharp glass edge become smooth on heating it upto its melting point in a flame ? Explain which property of liquids is responsible for this phenomenon.

Assertion A : Sharp glass edge becomes smooth on heating it upto its melting point. Reason R : The viscosity of glass decreases on melting. Choose the most appropriate answer from the options given below.

Bakelite on heating become a hard-non- fusible mass? Which property of bakelite is responsible for this change?

The process in which ore is heated in air below its melting point is known as :

Urea has a sharp melting point but glass does not. Explain.

Urea has a sharp melting point but glass does not. Explain.

Urea has a sharp melting point but glass does not. Explain.