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.
What may be the reason?

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,

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.

A definite quantity of water and coconut oil are heated in separate test tubes using the same amount of heat. a. In which case does the temperature increase slowly? b. What is the reason for this? c. Write any one practical application of this property.

Assertion: Small quantity of soap is used prepare a stable emulsion. Reason: Soap lowers the interfacial tension between oil and water.

The temperature of a city was found to be -9.3^@C. A car was used, whose radiator was filled with 5 L of water. What quantity of antifreczing agent ethylene glycol were added to water of radiator in order to use the car for travelling? ("K of water 1.86 K kg mol"^(-1))