Plaster of Peris hardens by

Options :
  1. giving off CO2
  2. Changing into CaCO3
  3. uniting with water
  4. giving out water

Answer and Explanation :-

Answer: Option 3


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I did not know that mankind were suffering for want of gold. I have seen a little of it. I know that it is very malleable, but not so malleable as wit. A grain of gold will gild a great surface, but not so much as a grain of wisdom.
-Henry David Thoreau Life Without Principle