Question

Assertion :$ZnC{O}_3\left(s\right)$ is soluble in $N{H}_3\left(aq\right)$ but $ZnS\left(s\right)$ is not Reason: Solubility product $\left(K_{sp}\right)$ for $ZnS$ is much smaller than for $ZnC{O}_3$ and a saturated solution of $ZnS$ does not produce a large enough $\left[Z{n}^{2+}\right]$ for the complex ion to form

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Both Assertion and Reason are incorrect

Answer 1

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

Option (A) is correct.
The $K_{sp}$ expression for a salt is the product of the concentrations of the ions, with each concentration raised to a power equal to the coefficient of that ion in the balanced equation for the solubility equilibrium.
Solubility product $\left(K_{sp}\right)$ for $ZnS$ is much smaller than for $ZnC{O}_3$, and a saturated solution of $ZnS$ does not produce a large enough $\left[Z{n}^{2+}\right]$ for the complex ion to form.