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

Question : 16

Given below is an approximate composition of a substance :

• CaO - 60-70%,
• SiO₂ - 20-25%,
• Al₂O₃ - 5-10%,
• Fe₂O₃ - 2-3%

a) marble stone

b) cement

c) plaster of Paris

d) quartz

Question : 17

Soaps are sodium salts of fatty acids. Which of the following fatty acid does not form soap?

a) Palmitic acid

b) Oleic acid

c) Butyric acid

d) Stearic acid