Physics, asked by Yashraj7873, 11 months ago

Crystal of a substance when heated in a closed testtube it changes its colour but when cool it regain its colour

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Answered by Anonymous

Like copper sulphate pentahydrate (CuSO4.5H2O). The hydrated form of this compound is blue in color but the anhydrous form is grey-white. PHENOMENON :- the crystals of hydrated salts are heated, they lose their water of crystallisation which is responsible for its color.

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