CUET · CHEMISTRY · PYQ PAPER 2025

Arrange the following oxides in decreasing order of oxidation state of the metal ion.
(A) Cu\(_2\)\(\mathrm{O}\)
(B) CrO\(_3\)
(C) Mn\(_2\)\(\mathrm{O}_7\)
(D) V\(_2\)\(\mathrm{O}_5\)
Choose the correct answer from the options given below:

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

Verified Solution

Answer & Solution

Correct Answer

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

Step-by-step Solution

Detailed explanation

For (A) Cu₂O: \( 2x + (-2) = 0 \Rightarrow x = +1 \) For (B) CrO₃: \( x + 3(-2) = 0 \Rightarrow x = +6 \) For (C) Mn₂O₇: \( 2x + 7(-2) = 0 \Rightarrow x = +7 \) For (D) V₂O₅: \( 2x + 5(-2) = 0 \Rightarrow x = +5 \) Decreasing order of oxidation state: (C) (+7), (B) (+6), (D)…

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

Explore more questions on app

From CUET

Explore more questions on app

List - I	List - II
(A) Taq DNA Polymerase	(I) Cleaves the DNA at ends
(B) Exonuclease	(II) Breaks the fungal cell wall
(C) Protease	(III) Stable above 90°C
(D) Chitinase	(IV) Break the protein molecules

Arrange the following oxides in decreasing order of oxidation state of the metal ion.(A) Cu\(_2\)\(\mathrm{O}\)(B) CrO\(_3\)(C) Mn\(_2\)\(\mathrm{O}_7\)(D) V\(_2\)\(\mathrm{O}_5\)Choose the correct answer from the options given below:

Step-by-step Solution

Arrange the following oxides in decreasing order of oxidation state of the metal ion.
(A) Cu\(_2\)\(\mathrm{O}\)
(B) CrO\(_3\)
(C) Mn\(_2\)\(\mathrm{O}_7\)
(D) V\(_2\)\(\mathrm{O}_5\)
Choose the correct answer from the options given below: