Question

Assertion. The colour of copper sulphate crystals change from blue to White on heating
Reason - The colour of anhydrous copper sulphate is white.​

Answer 1

Both Assertion and Reason are true and Reason is correct explaination of assertion

• Hydrated copper sulphate is usually blue in colour. It is also called as copper sulphate pentahydrate when it's in its hydrated state. The commercial name is 'blue vitriol'.
• However, when copper sulphate pentahydrate is heated, it looses the water molecules and again turns it to white coloured anhydrous copper sulphate.
• The colour of anhydrous copper sulphate is white because at this time no water molecule ligands are present that could split the d-orbital for colour formation.
• Hence, both Assertion and Reason are true and Reason is correct explaination of assertion.