The purity of gold is expressed in carats. The purest form of goldis.
1). 24 carats
2). 6 carats
3). 916 carats
4). 22 carats
1. Which among the following is used to dilute oxygen in the gas cylinders used by divers ?
2. The natural source of hydrocarbon is
3. Atomic number is the number equal to
5. The chief constituent of vinegar is
6. When formaldehyde and potassium hydroxide are heated we get
7. Which type of glass is used for making glass reinforced plastic?
8. The material which can be deformed permanently by heat and pressure is called a