Question

Copper sulphate pentahydrate is commonly called _______, whereas ferrous sulphate heptahydrate is commonly called ________ .

• A. white vitriol, blue vitriol
  
• B. green vitriol, blue vitriol
  
• C. blue vitriol, green vitriol
  
• D. blue vitriol, white vitriol
  

Answer 1

The correct option is C blue vitriol, green vitriol

Copper sulphate pentahydrate ($CuS{O}_4.5H_{2}O$) commonly known as blue vitriol contains five water molecules, that give it a blue colour. Similarly, the green color of ferrous sulphate heptahydrate ($FeS{O}_4.7H_{2}O$) is due to the seven molecules of water present in it.