For a liquid-gas interface, the convex side has a high pressure than the concave side. Which is better, washing of cloth in cool soap water or warm soap water? Why?

Soap decreases the surface tension of water. How does the decrease in surface tension benefit washing of clothes?

We use soaps and detergents for washing clothes. But in olden days people were using washing soda for that purpose. Can washing soda be used to clean clothes in all types of water. Justify your answer.

i) Rain water and séa, water differ in their behaviour towards soap. Give the difference and establish the chemistry behind this. ii) A water boiler in a factory burst due to high interior pressure. It was reported that the incident was occured due to certain dissolved salt in water used, As a chemistry student how will you explain this?

If water contains dissolved calcium hydrogen carbonate, out of soaps and synthetic detergents which one will you use for cleaning clothes "

Raju noticed that while washing clothes by using rain water collected in a tank, the quantity of soap required was found to be less than that required using tap water. a. If Raju asked the reason behind it, how will you explain it? b. Also mention any two methods to overcome.it,

In order to wash clothes with water containing dissolved calcium hydrogen carbonates, which cleaning agent will you prefer and why? Soaps or synthetic detergents give one advantage of soaps over synthetic detergents?