A) The molar solubilities of MY and \[\text{N}{{\text{Y}}_{\text{3}}}\]in water are identical.
B) The molar solubility of MY in water is less than that of \[\text{N}{{\text{Y}}_{\text{3}}}\]
C) The salts MY and \[\text{N}{{\text{Y}}_{\text{3}}}\]are more soluble in 0.5 M KY than in pure water.
D) The addition of the salt of KY to solution of MY and \[\text{N}{{\text{Y}}_{\text{3}}}\]will have no effect on their solubilities.
Correct Answer: B
Solution :
\[MY\to {{K}_{sp}}={{s}^{2}}=6.2\times {{10}^{-13}}\] \[s=\sqrt{6.2\times {{10}^{-13}}}\] \[s=7.87\times {{10}^{-7}}\,\text{mol}\,{{\text{L}}^{-1}}\] \[N{{Y}_{3}}\to {{K}_{sp}}=27\,{{s}^{4}}=6.2\times {{10}^{-13}}\] \[s={{\left( \frac{6.2\times {{10}^{-13}}}{27} \right)}^{1/4}}\] \[s=3.89\times {{10}^{-4}}\,\text{mol}\,{{\text{L}}^{-1}}\] \[\therefore \]molar solubility of \[N{{Y}_{3}}\] is more than MY in water.
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