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| 1. |
Mohan takes 5 mL of distilled water in four test tubes A, B, C and D. He dissolves sodium chloride in test tube A, calcium chloride in test tube B, magnesium chloride in test tube C and potassium chloride in test tube D. In which test tube(s) will scum be formed with soap? |
| Answer» Solution :Scum will be formed in test tubes B and C because calcium CHLORIDE and MAGNESIUM chloride make water hard and react with soap to FORM an insoluble white precipitate CALLED scum. | |