Copper sulphate crystals available in the market are blue coloured crystals. By careful heating, they turn to white colour. Which one of the following is responsible for the blue colour?
- A. Oxygen
- B. Nitrogen
- C. Water ✓
- D. Hydrogen
Correct Answer: C. Water
Explanation
The blue colour of copper sulphate crystals is due to the presence of water of crystallization. Heating removes this water, turning the crystals into anhydrous white powder.
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