COMEDK · Chemistry · 18. Electrochemistry

Two statements, one Assertion and the other Reason are given. Choose the right option.
Assertion: The Molar conductivity of KCl increases very slowly with dilution and approaches a limiting value when dilution is infinite.
Reason: In case of KCl there is an increase in the number of ions on dilution due to complete ionisation at infinite dilution.

A Both Assertion and Reason are correct but Reason is not the correct explanation of Assertion
B Both Assertion and Reason are correct and Reason is the correct explanation of Assertion
C Assertion is correct but Reason is incorrect
D Assertion is incorrect but Reason is correct

Verified Solution

Answer & Solution

Correct Answer

(C) Assertion is correct but Reason is incorrect

Step-by-step Solution

Detailed explanation

KCl is a strong electrolyte and is completely ionised in solution at all concentrations. Therefore, the number of ions does not increase upon dilution. The molar conductivity of a strong electrolyte like KCl increases slowly with dilution and approaches a limiting value at…

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.

Same subject

During a chemical reaction \(\mathrm{X} \rightarrow \mathrm{Y}\), the rates of reaction starting with initial concentrations of X as \(4.0 \times 10^{-3} \mathrm{M}\) and \(2.0 \times 10^{-3} \mathrm{M}\) are \(4.8 \times 10^{-4} \mathrm{~mol} \mathrm{~L}^{-1} / \mathrm{s}\) and \(1.2 \times 10^{-4} \mathrm{~mol} \mathrm{~L}^{-1} / \mathrm{s}\) respectively. What is the order of reaction with respect to X ?

COMEDK 2025 Medium

Based on Crystal Field theory, match the Complex ions listed in Column I with the electronic configuration in the d orbitals of the central metal ion listed in Column II.

No.	Complex	No.	d orbital configuration of central metal ion
A	\([Mn(CN)_6]^{4-}\)	P	\(e_g^2 t_{2g}^3\)
B	\([Co(H_2O)_6]^{2+}\)	Q	\(t_{2g}^4 e_g^2\)
C	\([Fe(H_2O)_6]^{2+}\)	R	\(t_{2g}^5\)
D	\([MnCl_4]^{2-}\)	S	\(t_{2g}^5 e_g^2\)

COMEDK 2024 Medium

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