CUET · CHEMISTRY · PYQ PAPER 2025
Considering the following statements; identify the correct statements:
(A) Scandium is regarded as a transition element, but zinc is not.
(B) \(V_{2}O_{3}\) is amphoteric and \(V_{2}O_{5}\) is basic oxide.
(C) The similar radii of Zr and Hf is a consequence of the lanthanoid contraction.
(D) The oxidation state of chromium in chromate and dichromate ion is same.
Choose the correct answer from the options given below:
- A (A), (B) and (D) only
- B (A), (B) and (C) only
- C (A), (C) and (D) only
- D (B), (C) and (D) only
Answer & Solution
Correct Answer
(C) (A), (C) and (D) only
Step-by-step Solution
Detailed explanation
(A) Correct. (B) \(V_2O_3\) is basic, \(V_2O_5\) is acidic/amphoteric. Incorrect. (C) Correct. (D) Oxidation state of Cr in \(CrO_4^{2-}\): \(x + 4(-2) = -2 \Rightarrow x = +6\) Oxidation state of Cr in \(Cr_2O_7^{2-}\): \(2y + 7(-2) = -2 \Rightarrow y = +6\) Statement (D) is…
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