Que.

Detergent produce alther with hard water because

  • A. they are soluble in hard water
  • B. they are colourless substances
  • C. the calcium and magnesium salts of sulpho are soluble in waternic acids
  • D. they form sodium carbonate with hard water

Right Answer is :
✓ C. the calcium and magnesium salts of sulpho are soluble in waternic acids
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