CUET · CHEMISTRY · PYQ PAPER 2023

Arrange the following electrolytes in the increasing order of van't Hoff factor (i) for complete dissociation of solute.
(A) \([\text{Co}(\text{NH}_3)_6]\text{Cl}_3\)
(B) \(\text{MgCl}_2\)
(C) \(\text{K}_4[\text{Fe}(\text{CN})_6]\)
(D) \(\text{KCl}\)
Choose the correct answer from the options given below:

A (A), (B), (C), (D)
B (D), (B), (A), (C)
C (D), (A), (B), (C)
D (C), (A), (B), (D)

Verified Solution

Answer & Solution

Correct Answer

(B) (D), (B), (A), (C)

Step-by-step Solution

Detailed explanation

(A) \( [\text{Co}(\text{NH}_3)_6]\text{Cl}_3 \rightarrow [\text{Co}(\text{NH}_3)_6]^{3+} + 3\text{Cl}^- \Rightarrow i=4 \) (B) \( \text{MgCl}_2 \rightarrow \text{Mg}^{2+} + 2\text{Cl}^- \Rightarrow i=3 \) (C)…

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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Match List-I with List-II

List-I (Potential difference across the terminal of a battery)	List-II (Situations)
(A) V = E	(I) Cell is being charged
(B) V = 0	(II) The internal resistance of a cell is zero
(C) V = E - ir	(III) cell is short-circuited
(D) V = E + ir	(IV) current is being drawn from a cell

Choose the correct answer from the options given below :

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