Match the mixture given in Column - I with their method of separation given in Column - II : Column - I – Column - II
(a) Oil mixed with water – (i) Sieving
(b) Iron powder mixed with flour – (ii) Decantation
(c) Salt mixed with water – (iii) Magnet with water
(d) Kidney beans mixed with rice flour – (iv) Evaporation

Question

Match the mixture given in Column - I with their method of separation given in Column - II : Column - I – Column - II
(a) Oil mixed with water – (i) Sieving 
(b) Iron powder mixed with flour – (ii) Decantation
(c) Salt mixed with water – (iii) Magnet with water
(d) Kidney beans mixed with rice flour – (iv) Evaporation

Accepted Answer

Option 2 is the correct answer because it accurately matches each mixture in Column - I with the appropriate method of separation in Column - II based on the physical properties of the components involved.

1. **(a) Oil mixed with water – (ii) Decantation**: Oil and water are immiscible liquids, meaning they do not mix. Decantation is a suitable method for separating such mixtures because it involves pouring off the top layer (oil) after allowing the mixture to settle, leaving the denser water behind.

2. **(b) Iron powder mixed with flour – (iii) Magnet**: Iron is a magnetic material, whereas flour is not. Using a magnet is an effective method to separate iron powder from flour because the magnet will attract the iron particles, leaving the flour behind.

3. **(c) Salt mixed with water – (iv) Evaporation**: Salt dissolves in water to form a homogeneous solution. Evaporation is the appropriate method to separate salt from water because it involves heating the solution until the water evaporates, leaving the salt crystals behind.

4. **(d) Kidney beans mixed with rice flour – (i) Sieving**: Kidney beans are much larger in size compared to rice flour particles. Sieving is an effective method for separating mixtures with components of different sizes, as the flour will pass through the sieve while the larger kidney beans are retained.

Now, let's explain why the other options are incorrect:

- **Option 1**: This option incorrectly matches (c) Salt mixed with water with (i) Sieving, which is not suitable because sieving cannot separate dissolved substances. It also matches (d) Kidney beans mixed with rice flour with (ii) Decantation, which is inappropriate because decantation is used for separating immiscible liquids, not solid mixtures.

- **Option 3**: This option incorrectly matches (a) Oil mixed with water with (iv) Evaporation, which is not suitable because evaporation is used for separating dissolved solids from liquids, not immiscible liquids. It also matches (b) Iron powder mixed with flour with (i) Sieving, which is ineffective because sieving cannot separate magnetic materials from non-magnetic ones.

- **Option 4**: This option incorrectly matches (c) Salt mixed with water with (i) Sieving, which is not suitable for separating dissolved substances. It also matches (d) Kidney beans mixed with rice flour with (iv) Evaporation, which is inappropriate because evaporation is used for separating dissolved solids from liquids, not solid mixtures.

Therefore, Option 2 is the only option that correctly matches each mixture with its appropriate method of separation.