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  • Identify the correct order of solubility in aqueous medium:Option: 1 <img alt="ZnS>Na_{2}S>CuS" src="https://learn.careers360.com/latex-image/?

Identify the correct order of solubility in aqueous medium:

Option: 1

ZnS>Na_{2}S>CuS


Option: 2

Na_{2}S>CuS>ZnS


Option: 3

Na_{2}S>ZnS>CuS


Option: 4

CuS>ZnS>Na_{2}S


Answers (1)

best_answer

The solubility of sulfides is directly proportional to the ionic character. 

The more the covalent character, the lower the solubility of the salt. 

Due to the poor shielding effect of d orbitals in d block elements, hence CuS and ZnS are more covalent in comparison to Na2S. 

in the case of  Cu2+ and Zn2+, Cu2+ has a smaller size hence, more charge-to-size ratio, more polarizing power, more covalent character, and lower solubility. 

The Correct answer is option 3. 

Posted by

vishal kumar

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