VVhich one of the following statements is not correct?
A. The presence of NaCI increases the rate of setting of Plaster of Paris
B. Gypsum is added to the cement to slow down its rate of setting
C. All alkaline earth metals form hydrated salts
D. Barium and Strontium are found free in nature
Answer: Option D
This Question Belongs to Chemistry GK Chapter Wise >> Acid, Base And Salts
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