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Q: The impurity of mixing water which affects the setting time and strength of concrete is ..........
  • A. Sodium sulphates
  • B. Sodium chlorides
  • C. Sodium carbonates and bicarbonates
  • D. Calcium chlorides
Correct Answer: Option C - The impurity of mixing water affected the setting time and strength of concrete is sodium carbonate (NaCO₃)
C. The impurity of mixing water affected the setting time and strength of concrete is sodium carbonate (NaCO₃)

Explanations:

The impurity of mixing water affected the setting time and strength of concrete is sodium carbonate (NaCO₃)