KCET2018Chemistrys Block Elements
Dead burnt plaster is
Options
- A( CaSO ₄ )
- B( CaSO ₄ 1 2 H ₂ O )
- C( CaSO ₄ H ₂ O )
- D( CaSO ₄ 2 H ₂ O )
Correct answer
A. ( CaSO ₄ )
Step-by-step solution
When gypsum is heated at temperature above ( 393 ~K ) than, there no water of crystallization is left and anhydrous calcium sulphate ( ( CaSO ₄ ) ) is formed. This is known as dead burnt plaster. [ CaSO ₄ 2 H ₂ O Gypsum CaSO ₄ +2 H ₂ O ]