Setting of plaster of paris is

Options :
  1. oxidation with atmospheric oxygen
  2. combination with atmospheric carbondioxide
  3. dehydration
  4. Hydration to yield another hydrate

Answer and Explanation :-

Answer: Option 4


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I see at last that all the knowledgeI wrung from the darkness-that the darkness flung me-Is worthless as ignorance: nothing comes from nothing,The darkness from the darkness. Pain comes from the darknessAnd we call it wisdom. It is pain.
-Randall Jarrell The Complete Poems