Question

Colour change of blue vitriole on heating is a:

• A. chemical property of vitriole
• B. physical property of vitriole
• C. can't be predicted
• D. none

Answer 1

The correct option is A chemical property of vitriole

Blue vitriol, as we know it, is hydrated Copper(II) Sulphate, meaning $CuS{O}_4.5H_{2}O.$ When blue vitriol is heated, those water of crystallization escape out of the crystal and what's left is anhydrous copper sulphate or simply $CuS{O}_4$, without any water of crystallization.