Question

3. An example of solid lubricant
a) graphite
b) soap
c) grease
d) None of these
4. The role of glycerol in tooth paste is to prevent
a) fungus growth
b) sedimentation
c) drying
d) decomposition
5. The raw material used to make chalk pieces is
a) Starch
b) Calcium carbonate
c) Gypsum
d) None of these​

Answer 1

Answer:

3. b) soap

4. c) drying

5. b) CaCO3