AP EAMCET2004Chemistrys Block Elements
In the hardening stage of plaster of paris, the compound formed is
Options
- ACaSO ₄
- BOrthorhombic CaSO ₄ 2 H ₂ O
- CCaSO ₄ H ₂ O
- DMonoclinic CaSO ₄ 2 H ₂ O
Correct answer
D. Monoclinic CaSO ₄ 2 H ₂ O
Step-by-step solution
Plaster of paris absorb water to form monoclinic gypsum which is a hard substance. CaSO ₄ 1 2 H ₂ O 3 / 2 H ₂ O CaSO ₄ 2 H ₂ O (monoclinic gypsum)