Question

Match list I with list II and select the correct answer using the codes given below the lists .

	List I	List II
1.	Heavy water	(A) Bicarbonates of Mg and Ca in water
2.	Temporary hard Water	(B) No foreign ions in Water
3.	Soft water	(C) D2O
4.	Permanent hard Water	(D) Sulphates and chlorides of Mg and Ca in water

Codes.

• A. 1-C, 2-D, 3-B, 4-A
• B. 1-B, 2-A, 3-C, 4-D
• C. 1-B, 2-D, 3-C, 4-A
• D. 1-C, 2-A, 3-B, 4-D

Answer 1

Answer: (D)

1-C, 2-A, 3-B, 4-D

Answer 2

Heavy water is $D_{2}O$ (1 – c)

Temporary hard water contains bicarbonates of $Ca^{2 +}$ and $Mg^{2 +}(2 - a)$

Soft water may have no foreign ions $(3 - b)$.

Permanent hard water contains sulphates and chlorides of $Ca^{+ 2}$ and $Mg^{2 +}(4 - d)$