give reason for the colour change?
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The color of an object depends upon which wavelengths of light it reflects back to your eyes. If the object changes color, then your eyes are seeing one wavelength of light and then a different wavelength of light.
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When heated strongly, the water molecules in the crystal are lost. It changes into white colored anhydrous copper sulphate. When water is added to it, then it again changes back to blue color.
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