Calcium sulphate is found in nature in two forms, anhydrous calcium sulphate and hydrated calcium sulphate. When anhydrous calcium sulphate is heated with coke, sulphur dioxide gas is obtained. When hydrated calcium sulphate is heated to 200∘C , it forms anhydrous salt.
When calcium sulphate is mixed with conc. HCl and the paste is formed. What colour is obtained when a pinch of this paste is brought near the flame?
a. golden yellow
b. brick red
c. crimson red
d. apple green