Question

The chemical formula of blue coloured Copper Sulphate crystal is_____

• A. CuSO₄.H₂O
• B. CuSO₄.2H₂O
• C. CuSO₄.5H₂O
• D. CuSO₄.10H₂O

Answer 1

The Correct Option is C

To solve this question, we need to identify the chemical formula of the blue-colored copper sulfate crystal.

1. Understanding Copper Sulfate Crystals:
- Copper sulfate (CuSO₄) can form hydrated crystals, which are blue in color. The blue color is due to the presence of water molecules in the crystal structure.

2. Identifying the Correct Hydrate:
- The blue-colored copper sulfate crystals are typically in the form of CuSO₄·5H₂O, known as copper sulfate pentahydrate.

3. Analyzing the Options:
- Option (A) CuSO₄·H₂O: This represents copper sulfate monohydrate, which is not blue in color.
- Option (B) CuSO₄·2H₂O: Represents copper sulfate dihydrate, which is not blue.
- Option (C) CuSO₄·5H₂O: This is the correct formula for blue copper sulfate crystals (copper sulfate pentahydrate).
- Option (D) CuSO₄·10H₂O: This is not correct for the blue-colored copper sulfate.

Final Answer:
Option (C) CuSO₄·5H₂O is correct.