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Chemical Bonding and Molecular Structure question

2013 · Q98
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Chemical Bonding and Molecular Structure question

2013 · Q98

NEETChemistryChemical Bonding and Molecular StructureMCQ+4 / −1
Identify the correct order of solubility in aqueous medium.
  1. A
    Na2S > CuS > ZnS
  2. B
    Na2S > ZnS > CuS
  3. C
    Cus > ZnS > Na2S
  4. D
    ZnS > Na2S > CuS
View written solutionFree

Correct answer: B

Water is a polar compound so the salt which is more polar or having more ionic character will be more soluble in it. According to Fajan's rule, ionic character of compound increases with increase in the size of cation. Now, among the given compounds, the size of cations are in the order as follows :

Na+ > Zn2+ > Cu2+

Thus, the order of ionic character and the solubility order in aqueous medium is as follows :

Na2S > ZnS > CuS

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