Would you be able to check if water is hard by using a detergent?

(i) How would you prepare dihydrogen from water using a reducing agent ? (ii) How would you prepare dihydrogen from a substance other than water ? (iii) How would you prepare pure dihydrogen in the laboratory ?

Which of the following mixtures would you be able to separate using the method of filtration?

If you mix oil in the water then oil keeps floating on water but in detergent water it gets mixed this is because

How dirty clothes can be cleaned using a detergent in hot water?

Soaps are the detergents used since long. Soaps used for cleansing purpose are sodium or potassium salts of long chain fatty acids such as stearic acid, palmitic acid. These cannot be used with hard water. Synthetic detergents are cleansing agents which have all the properties of soap but which actually do not contain any soap. These can be used both in soft water and hard water as they give foam even in hard water. Which is not true for a detergent molecule ?

Soaps are the detergents used since long. Soaps used for cleansing purpose are sodium or potassium salts of long chain fatty acids such as stearic acid, palmitic acid. These cannot be used with hard water. Synthetic detergents are cleansing agents which have all the properties of soap but which actually do not contain any soap. These can be used both in soft water and hard water as they give foam even in hard water. Which of the following is called invert soap?