JEE Mains · Chemistry · STD 11 - 6.2. Equilibrium - II (icon Equilibrium)

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 \(Cu ^{2+}( aq )+ S ^{2-}( aq ) \rightleftharpoons \operatorname{CuS}( s )\) is high because the solubility product is low.

A Both \(( A )\) and \(( R )\) are true and \(( R )\) is the explanation for \((A)\)
B Both \((A)\) and \((R)\) are false
C \((A)\) is false and \(( R )\) is true
D Both \(( A )\) and \(( R )\) are true but \(( R )\) is not the explanation for \((A)\)

Verified Solution

Answer & Solution

Correct Answer

(D) Both \(( A )\) and \(( R )\) are true but \(( R )\) is not the explanation for \((A)\)

Step-by-step Solution

Detailed explanation

Slow or fast process is kinetic parameter but extent less or more is hermodynamic parameter.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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List - I (Complex)		List - II (Hybridisation)
(A)	[CoF₆]^3-	(I)	d²sp³
(B)	[NiCl₄]^2-	(II)	sp³
(C)	[Co(NH₃)₆]³⁺	(III)	sp³d²
(D)	[Ni(CN)₄]^2-	(IV)	dsp²