Question

Identify the correct statement.

A. Amorphorous solids have well definied shapes and are arranged in an orderly fashion.

B.Solid Water is more dense than liquid water.

C.When the adhesive forces of liquid are greater than the cohesive forces the meniscus un a capillary tube will be concave

D. Strong electrolytes undergo extremely little ion dissociation

None are correct.

Answer 1

A. Amorphous solids are powdered in nature; amorphous solids combine with water of crystallization to form crystalline solids. Crystalline solids have well-defined geometric shapes and are the crystals are arranged in an ordered fashion. Hence, statement A is false.

B. The density of water is highest at 4°C. Since ice exists at temperature below 0°C, hence, the density of ice is lower than that of water. Therefore, the given statement is false.

C. Cohesion is the force of attraction between individual liquid molecules while adhesion is the force of attraction between the liquid and other polar or non-polar molecules, like for example, between the water and the walls of a container. When adhesive forces are greater than cohesive forces, the liquid sticks to the walls of the container. The capillary action of a liquid adds to this effect and makes the liquid surface concave up. Hence, the given statement is correct.

D. Strong electrolytes exist as a combination of oppositely charged ions. Strong electrolytes, therefore, dissociate completely into ions in aqueous solutions. Therefore, the statement is false.