Dehydration of hydrates of halides of calcium, barium and strontium i.e., CaCl26H2O, BaCl2.2H2O, SrCl2.2H2O, can be achieved by heating. These become wet on keeping in air. Which of the following statements is correct about these halides?
(i) Act as dehydrating agent
(ii) Can absorb moisture from air
(iii) Tendency to form hydrate decreases from calcium to barium
(iv) All of the above
Dehydration of hydrates of halides of calcium, barium and strontium i.e., CaCl26H2O, BaCl2.2H2O, SrCl2.2H2O, can be achieved by heating. These become wet on keeping in air. Which of the following statements is correct about these halides?
(i) Act as dehydrating agent
(ii) Can absorb moisture from air
(iii) Tendency to form hydrate decreases from calcium to barium
(iv) All of the above
This is a multiple choice type question as classified in NCERT Exemplar
Correct option (iv)
Chlorides of alkaline earth metals are hydrated salts. They can be used as dehydrating agents due to their hygroscopic nature to absorb moisture from air. Extent of hydration decreases from Mg to Ba.
Therefore,
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Li+ has the highest hydration enthalpy.
Hence it is most hydrated
Therefore, Correct order of hydrated radii is Cs+ < Rb+ < K+ < Na+ < Li+
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Chemistry NCERT Exemplar Solutions Class 11th Chapter Ten 2025
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