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HCl was passed through a solution of CaCl2, MgCl2 and NaCl. Which of the following compound(s) crystallise(s)?
  • a)
    only MgCl2
  • b)
    NaCl, MgCl2 and CaCl2
  • c)
    Both MgCl2 and CaCl2
  • d)
    Only NaCl
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
HCl was passed through a solution of CaCl2, MgCl2 and NaCl. Which of t...
MgCl2 has least solubility among CaCl2, MgCl2 & NaCl thats why it crystallise first on passing HCl.
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HCl was passed through a solution of CaCl2, MgCl2 and NaCl. Which of t...
Passing HCl through a solution of CaCl2, MgCl2, and NaCl will result in the formation of their respective hydrochloric acids.

The possible reactions that can occur are:

CaCl2 + 2HCl → CaCl2•2H2O (calcium chloride dihydrate) + 2HCl
MgCl2 + 2HCl → MgCl2•6H2O (magnesium chloride hexahydrate) + 2HCl
NaCl + HCl → NaCl (sodium chloride)

From the reactions, we can see that only MgCl2 will crystallize as MgCl2•6H2O, while CaCl2 will form a dihydrate and NaCl does not form a hydrate. Therefore, the correct answer is option 'A' - only MgCl2 will crystallize.
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HCl was passed through a solution of CaCl2, MgCl2 and NaCl. Which of t...
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HCl was passed through a solution of CaCl2, MgCl2 and NaCl. Which of the following compound(s) crystallise(s)?a)only MgCl2b)NaCl, MgCl2 and CaCl2c)Both MgCl2 and CaCl2d)Only NaClCorrect answer is option 'A'. Can you explain this answer?
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