Ncert Exercises & Solutions

Identify the correct formula of halides of alkaline earth metals from the following.

1. ${BaCl}_{2} \cdot 2 H_{2} O$

2. ${BaCl}_{2} \cdot 4 H_{2} O$

3. ${CaCl}_{2} \cdot 6 H_{2} O$

4. ${SrCl}_{2} \cdot 4 H_{2} O$

Choose the correct option
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, c)

Hint: Hydration energy decreases down the group

All the chlorides of alkaline earth metals are hydrated to different extents and the extent of hydration decreases from Mg to Ba e.g.

{MgCl}_{2} \cdot 6 H_{2} O

{CaCl}_{2} \cdot 6 H_{2} O

{BaCl}_{2} \cdot 2 H_{2} O

{SrCl}_{2} \cdot 2 H_{2} O