what will happen if you add water and some oil drops instead of solid calcium chloride in test tube D? Give reason.
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Foam will be formed in test tube B because the water in it is softer than water in test tube A. On adding calcium chloride to the water the water becomes hard. When you add soap to hard water, an insoluble substance is formed by the reaction of soap with the calcium salts. This is called . The interferes in the cleaning action of soap.
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