JEE Main Chemistry question
Sulphide ions in alkaline solution react with solid sulphur to form polyvalent sulphide ions. The equilibrium constants for formation of S₂²⁻ and S₃²⁻ from S and S²⁻ ions are 1.7 and 5.3 respectively. Equilibrium constant for formation of S₃²⁻ from S₂²⁻ and S is:
Answer: (B)
Solution
Overall (S+S²⁻→S2²⁻→S3²⁻) K(overall)=K(S+S²⁻→S2²⁻)×K(target). K(target) = 5.3/1.7 = 3.11.