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Chemistry · PYQ NEET UG 2020

हिन्दी

HCl was passed through a solution of \( \mathrm{CaCl_2} \), \( \mathrm{MgCl_2} \) and \( \mathrm{NaCl} \). Which of the following compound(s) crystallise(s)?

  1. Only NaCl
  2. Only \( \mathrm{MgCl_2} \)
  3. \( \mathrm{NaCl, MgCl_2}\text{ and }\mathrm{CaCl_2} \)
  4. Both \( \mathrm{MgCl_2}\text{ and }\mathrm{CaCl_2} \)

Correct answer · Option 1

Only NaCl

Explanation

Due to the common ion effect of \( \mathrm{Cl^-} \) ions from HCl, the solubility product of NaCl is exceeded, causing it to crystallise out.
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