Preparations Properties Uses Of S Block Elements

Among the role of gypsum, CaSO₄.2H₂O in the setting of cement, identify the correct option from the following:

1. It fastens the setting process

2. It provides water molecules for the hydration process

3. It helps to remove water molecules

4. It slows down the setting process

Match List-I with List-II.

	List-I		List-II
(a)	Li	(i)	absorbent for carbon dioxide
(b)	Na	(ii)	electrochemical cells
(c)	KOH	(iii)	coolant in fast breeder reactors
(d)	Cs	(iv)	photoelectric cell

Choose the correct answer from the options given below:

	(a)	(b)	(c)	(d)
1.	(ii)	(iii)	(i)	(iv)
2.	(iv)	(i)	(iii)	(ii)
3.	(iii)	(iv)	(ii)	(i)
4.	(i)	(iii)	(iv)	(ii)