JEE Main 2020 — Ionic Equilibrium Question with Solution
From: JEE Main 2020 (Online) 2nd September Morning Slot
Question
For the following Assertion and Reason, the
correct option is
Assertion (A): When Cu (II) and sulphide ions are mixed, they react together extremely quickly to give a solid.
Reason (R): The equilibrium constant of
Cu2+(aq) + S2–(aq) ⇌ CuS(s) is high because the solubility product is low.
Assertion (A): When Cu (II) and sulphide ions are mixed, they react together extremely quickly to give a solid.
Reason (R): The equilibrium constant of
Cu2+(aq) + S2–(aq) ⇌ CuS(s) is high because the solubility product is low.
Choose an option
Show full solutionCorrect option: C
Correct answer
CBoth (A) and (R) are true and (R) is the
explanation for (A).
Step-by-step explanation
Ksp value of CuS is very low 10–36 (3.6 × 10–36)
due to low Ksp value Cu+2 ion gets precipitated
very quickly even with very low concentration
of S–2 ion.
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