Which of the following statements about gypsum is not correct?

Nitrocellulose glues are prepared from _____

Total sulphur content in the cement should not be more than _____

Which of the following is not a natural abrasive?

Which of the following is not a synthetic resin?

Buna-S, Neoprene and Butyl are different trade names of _____

We can obtain lake asphalt from lakes at _____

Expanding cement is obtained by the addition of an expanding medium like _____ to the ordinary cement.