The halides of alkaline earth metals form hydrates such as $MgCl_2 \cdot 6H_2O$,$CaCl_2 \cdot 6H_2O$,$BaCl_2 \cdot 2H_2O$,and $SrCl_2 \cdot 2H_2O$. What does this indicate about the halides of group $2$ elements?

  • A
    They are hygroscopic in nature.
  • B
    They act as dehydrating agents.
  • C
    They can absorb moisture from the air.
  • D
    All of the above.

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