Which of the following compounds will form a solution if exposed to air?

  • A Na2CO3.10H2O
  • B NaNO3
  • C CuSO4
  • D CaCl2
  • E Na2SO4.10H2O

The correct answer is D. CaCl2

Calcium chloride is a deliquescent substance. It attracts water from the atmosphere and then forms a solution.

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