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प्रश्न
When a crystal of copper sulphate is placed at the bottom of a beaker containing water, the water slowly turns blue. Why?
उत्तर
When a crystal of copper sulphate is placed at the bottom of a beaker containing water, the particles or molecules of copper sulphate start diffusing into the particles or molecules of water. The particles of water have large inter-molecular spaces between themselves, which are slowly occupied by the particles of copper sulphate; thereby, turning the water blue.
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