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Crystals of copper sulphate pentahydrate, on heating, form :

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EPFO EO AO 2023

blue colour salt

white colour salt

green colour salt

brown colour salt

- Copper sulphate pentahydrate is typically a blue crystalline solid due to the water of crystallization.

- On heating, it loses this water, turning into an anhydrous form.

- The anhydrous copper sulphate is white since the blue color is due to hydrated copper ions.

- The transformation from blue to white happens as water is driven off, removing the crystal's color.

- Correct Answer: white colour salt