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 equilibr

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  is high because the solubility product is low.

Canvas Classes · Accepted Answer

Step 1 — Evaluate Assertion (A):
Cu²⁺ and S²⁻ ions react rapidly to form CuS precipitate (extremely insoluble). A is true ✓

Step 2 — Evaluate Reason (R):
-  of CuS is extremely small ()
- The equilibrium constant for the precipitation reaction is , which is very large
- A very large  means the reaction goes essentially to completion  very fast and complete precipitation
- R is true ✓ and correctly explains A

Step 3: The low  directly causes the high equilibrium constant for precipitation, whic

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