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Q.

 HCl gas is passed  through a saturated solution of NaCl containing  MgCl2&CaCl2  impurities. NaCl is precipitated  during this process which is best explained by

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a

More ionic character in NaCl

b

High lattice enthalpy of NaCl

c

Lesser solubility of NaCl compared to  MgCl2  and  CaCl2

d

High Polarising Power of  Na+ ion

answer is C.

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Detailed Solution

Solubility of  NaCl is lesser than that of CaCl2  &MgCl2 . When HCl gas  is passed through the mixture,  [Cl] increases, Ionic product of NaCl exceeds its solubility product easily.  Thus it gets precipitated

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