Action of soap is due to emulsification and micelle formation. Comment.

When water is added to a compound of calcium (A),solution of compound B is formed. When carbondioxide gas is passed into the solution, it turms milky due to formation of compound C. If excess of carbon dioxide is passed into to the solution, milkiness disappears due to the formation of D, Identify A, B, C and D.

A helicopter of mass 1000 kg rises with a vertical acceleration of 15 m s^2. The crew and the passengers weigh 300 kg. Give the magnitude and direction of the (a) force on the floor by the crew and passengers, (b) action of the rotor of the helicopter on the surrounding air, (c) force on the helicopter due to the surrounding air.

Fill in the blanks: The formation of micelles takes place only above a particular temperature called____________.

What are associated colloids? Briefly describe the cleansing action of soap

Soap is a weak antispetic. What may be added to improve its antiseptic action?

Due to capillary action a liquid will rise in a tube if the angle of contact is

Explain the formation of scum when hard water is treated with soap.