some important man made materials - Category wise Question and Answer Practice Test with Solutions

Question : 16

Soaps are

a) sodium salts of trihydroxy alcohols

b) sodium salts of fatty acids containing carbon atoms 16 to 18

c) sodium salts of sulphuric acids containing carbon atoms 10 to 16

d) none of these

Question : 17

The reaction that takes place in soap making is called saponification. Basically soap is sodium or potassium salts of

a) long chain dicarboxylic acids

b) glycerol

c) long chain monocarboxylic acids

d) long chain tricarboxylic acids

Question : 18

Which of the following statements about vitamin B12 is incorrect?

a) It is also present in rain water

b) It occurs in plants

c) It has a cobalt atom

d) It is needed for human body in very small amounts

Question : 19

Glass is a transparent substance obtained by heating silica with oxides or carbonates of metals. Glass is a mixture of

a) oxides

b) sulphates

c) phosphates

d) silicates

Question : 20

Which of the following statements, is not correct, about glass?

a) The silicate units in glass are arranged in a way that is quite similar to the arrangement found in liquids.

b) There is no definite melting point for glass.

c) Because of its high viscosity glass exists in solid state

d) Glass is a solid because it has a regular crystalline arrangement.