Discuss how permanent hardness of water can be removed.

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

What is myopia? How it can be removed?

What is astigmatism? How it can be removed?

Which compound is used in the estimation of hardness of water volumetrically?

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

A bucket is in the form of a frustum of a cone. In depth is 15 cm and the diameters of the top and bottom are 56 cm and 42 cm respectively. Find how many litres of water can the bucket hold (pi=22/7) .

Discuss how electron affinity of elements changes along a period and down a group.

A mixture of mustard oil and water can be separated by

How can tooth decay be prevented?