Question

Assertion : $S{b}_2{S}_3$ is not soluble in yellow ammonium sulphide.
Reason : The common ion effect due to $S^{2-}$ ions reduces the solubility of $S{b}_2{S}_3$.

• A. If both assertion and reason are true and reason is the correct explanation of the assertion
• B. If both assertion and reason are true but reason is not the correct explanation of the assertion
• C. If assertion is true, but reason is false
• D. Both assertion and reason are false statements

Answer 1

Answer: (D)

Antimony trisulphide $S{b}_2{S}_3$ is soluble in yellow ammonium sulphide forming ammonim thioantimonate.
$S{b}_2{S}_3+\underset{\text{ Amm. sulphide}}{3{\left(N{H}_4\right)}_{2}S}+2S⟶\underset{\text{Ammonium thio antimonate }}{2{\left(N{H}_4\right)}_{3}Sb{S}_4}$
The common ion effect due to $S^{2-}$ ion does not reduces the solubility of $S{b}_2{S}_3$. So both the statements are false.