Describe one method for removal of temporary hardness of water.

What do you mean by temporary hardness of water Mention two-method to remove this hardness of water.

Distinguish between ortho and para hydrogen Describe one method of preparation of H_2O_2 in the laboratory.

Mention a method used for desalination of sea water.

Prove that the area of an equilateral triangle described on one side of a square is equal to half the area of the equilateral triangle described on one of its diagonals.

Write one method of preparation of Aromatic hydrocaboan

Write one chemical reaction to show the amphoteric nature of water.

Describe a method of producing plane polarised light.

Choose the correct answer : One of the compounds that causes permanent hardness of water is