Question

what is common among plaster of Paris, sodium carbonate, gypsum​

Answer 1

Answer:

They are all hydrated, crystalline salts.

i.e They have water of crystallisation with them.

Plaster Of Paris - CaSO4 . 1/2 H2O

Sodium Carbonate - Na2CO3.10H2O

Gypsum - CaSO4.2H2O

Hope it helps!!!

Answer 2

Answer:Calcium and oxygen

Explanation: