Question

which of the following is a super cooled liquid?
a.) Glass
b.) Ammonia
c.) Ice cream
d.) Wood

Answer 1

Hint: Amorphous solids on heating start softening, melting and flowing. Amorphous solids have a tendency to flow very slowly. They have features similar to liquids and are considered extremely viscous liquids. Their liquids solidify on cooling.

Complete step by step answer:
-On the basis of order present in arrangement of constituent particles, Solids can be classified as crystalline and amorphous.
-In crystalline solids, there are large number of small crystals
-Each crystal has a definite geometrical shape. The arrangement is three dimensional and ordered.
-In crystal there is a regular pattern which repeats itself over the entire crystal.
-Rubber, many plastics and glass do not form crystals when their liquids solidify on cooling. These are amorphous solids.
-amorphous means no form. In such solids, arrangement of constituent particles has short range of order. Arrangement is disordered and patterns are scattered.
-structure of amorphous solid is similar to liquids.
-crystalline solids have sharp melting and boiling point. They melt at characteristic points and become liquid.
-amorphous solids start flowing over a range of temperature, soften and melt.
-Features of amorphous solids are similar to liquids and amorphous solids are considered extremely viscous liquids.
-Amorphous substances have a tendency to flow through very slowly. Therefore, they are called super cooled liquid.
So, the correct answer is “Option A”.

Note: Glass does not form crystals when their liquids solidify on cooling. It starts flowing over a range of temperatures. It can be molded and blown into various shapes. Some glass objects from ancient times are found to be milky due to crystallization. Glass has a tendency to flow very slowly.