Answer: Option ii)
The addition of gypsum serves only to slow down the setting process of the cement, allowing it to solidify to a sufficiently hard state before use.
By adding gypsum to cement (i) setting time of cement becomes less. (ii) setting time of cement increases. (iii) colour of cement becomes light. (iv) the shining surface is obtained.
By adding gypsum to cement (i) setting time of cement becomes less. (ii) setting time of cement increases. (iii) colour of cement becomes light. (iv) the shining surface is obtained.