Question

Dehydration of hydrates of halides of calcium, barium and strontium i.e., $CaCl_2 \cdot 6H_2O$, $BaCl_2 \cdot 2H_2O$, $SrCl_2 \cdot 6H_2O$, 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 1

Answer: (D)

All of the above

Answer 2

Halides of calcium, barium and strontium act as dehydrating agent as they are hygroscopic in nature. They absorb moisture. Also they have tendency to form hydrate which decreases from $Ca ^{2+}$ to $Sr ^{2+}$ due to increase in size and decrease in polarization power.