Q. 21

Dehydration of hydrates of halides of calcium, barium and strontium i.e., CaCl26H2O, BaCl2 .2H2 O, SrCl2.2H2O, can be achieved by heating. These become wet on keeping in air. Which of the following statements is correct about these halides?
A. act as dehydrating agent

B. can absorb moisture from air

C. Tendency to form hydrate decreases from calcium to barium

D. All of the above

Answer :

The substances get wet on contact with air as they are hygroscopic in nature and can absorb moisture around them. The tendency to form halide hydrates gradually decreases down the group. For example, MgCl2 .8H2O, CaCl2.6H2O, SrCl2.6H2O and BaCl2.2H2O. Hence, all the properties are correct and the correct answer is (iv).

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