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NEET 2013
Exam
NEET
Year
2013
Subject
Chemistry
Chapter
Classification of Elements and Periodicity in Properties

NEET 2013 · Chemistry · Classification of Elements and Periodicity in Properties

Identify the correct order of solubility in aqueous medium.

Identify the correct order of solubility in aqueous medium.

Options

  1. ACuS>ZnS>Na2 S\mathrm{CuS}>\mathrm{ZnS}>\mathrm{Na}_2 \mathrm{~S}
  2. BZnS>Na2 S>CuS\mathrm{ZnS}>\mathrm{Na}_2 \mathrm{~S}>\mathrm{CuS}
  3. CNa2 S>CuS>ZnS\mathrm{Na}_2 \mathrm{~S}>\mathrm{CuS}>\mathrm{ZnS}
  4. DNa2 S>ZnS>CuS\mathrm{Na}_2 \mathrm{~S}>\mathrm{ZnS}>\mathrm{CuS}

Correct answer

D. Na2 S>ZnS>CuS\mathrm{Na}_2 \mathrm{~S}>\mathrm{ZnS}>\mathrm{CuS}

Step-by-step solution

lonic compounds are more soluble in water or in aqueous medium. lonic character ∝\propto size of cation (if anion is same) The order of size of cation is Na+\mathrm{Na}^{+}>Zn2+\mathrm{Zn}^{2+}>Cu2+∴\mathrm{Cu}^{2+}\therefore The order of ionic character and hence, of solubility in water is as \mathrm{Na}}_{2} \mathrm{ S}>\mathrm{ZnS}>CuS\mathrm{CuS}
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