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In test tube A the length of the foam be longest because soap form foam easily with distilled water. underground water & calcium sulphate containing water when react with form do not form foam(lather) .it forms scum due to calcium & magnesium salts.
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Here is your answer
In test tube A the length of the foam be longest because soap form foam easily with distilled water. underground water & calcium sulphate containing water when react with form do not form foam(lather) .it forms scum due to calcium & magnesium salts.
☺✌Hope it will help you☺✌
✌Mark as brainliest✌
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