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Q: What is the function of the chemical SO₃ present in Ordinary Portland cement?
  • A. Responsible for quick setting
  • B. Gives strength
  • C. Makes cement sound
  • D. Imparts colour and hardness
Correct Answer: Option C - Sulphur or sulphur trioxide in the cement is about 1-2% its function is to make the cement sound, it is in excess quantity the cement becomes unsound.
C. Sulphur or sulphur trioxide in the cement is about 1-2% its function is to make the cement sound, it is in excess quantity the cement becomes unsound.

Explanations:

Sulphur or sulphur trioxide in the cement is about 1-2% its function is to make the cement sound, it is in excess quantity the cement becomes unsound.