Plaster of Paris is made by partial dehydration of
1). Epsom salt
2). gypsum salt
3). blue vitriol
4). green vitriol
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2. Main pollutants released from iron and steel industry are
3. Which of the following is the treatment of water pollution?
5. Dry ice is
6. This group of alumino silicate minerals is widely used In making electrical insulators
7. Which of the following elements is non-radioactive ?
8. Which inetal does not undergo corrosion due to the formation of oxide layer
9. Which of the following is not a method of preparing oxygen?