Question

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

List 1	List 2
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. ${D_2}O$
4. Permanent hard water	D. Sulphates and chlorides of Mg and Ca in water..

Answer 1

The given form of water is the types of water depending on the composition and ions present in the water. The heavy water is formed of one of the isotopes of hydrogen which is the heavier isotope. The temporary hard water contains bicarbonate salts of metal cation.

Complete step by step answer:
${D_2}O$ is known as heavy water which is the form of water which only contains deuterium and does not contain any other isotope of hydrogen. The presence of deuterium gives water a different nuclear property and due to the increase in mass it shows different physical and chemical properties with respect to normal water.
The hardness of water is detected by the concentration of multivalent cations present in water. The multivalent cations are a positively charged species having charge usually +2. The cations present in water which results in the hardness of water $C{a^{2 + }}$ and $M{g^{2 + }}$. The temporary hardness of water is due to the presence of dissolved calcium bicarbonate and magnesium bicarbonate.
Soft water contains low concentration of calcium ion and magnesium ion. The soft water contains no foreign ions.
The permanent hardness of water is due to the presence of sulphate and chloride salts of magnesium and calcium.
Therefore, the correct match is $1 \to C,2 \to A,3 \to B,4 \to D$

List 1	List 2
1.Heavy water	C. ${D_2}O$
2. Temporary hard water	A. Bicarbonates of Mg and Ca in water B. No foreign ions in water
3. Soft water	B. No foreign ions in water
4. Permanent hard water	D. Sulphates and chlorides of Mg and Ca in water..

Note: The soft water is the natural occurring form of water which is present near rainfall and the drainage basin of the river. Water softening is a method used to remove calcium, magnesium and other ions from the hard water..