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The students of grade 7 were asked to conduct an experiment on crystallization in the Chemistry lab. The students took some copper sulphate granules from the labelled bottle and dissolved it in some water in a dish. Then they heated it for a while using a spirit lamp. They showed the result to their teacher; but the teacher could not see any crystals of CuSO4 in the dish. The reason for this is that the crystals of copper sulphate are formed only when |
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