The following chemical is used for hardening of plaster of Paris cast of tyre mark?
A. Sodium sulphate
B. Sodium chloride
C. Sodium carbonate
D. Aluminium sulphate
Answer:C
The following chemical is used for hardening of plaster of Paris cast of tyre mark?
A. Sodium sulphate B. Sodium chloride C. Sodium carbonate D. Aluminium sulphate