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UPSC 2002: Match List I (Oxidation number) with List II (The element) and select the correct answer using the codes given below the lists: List I (Oxidation number) — List II (The element) A. 2 — 1. Oxidation number of Mn in MnO₂ B. 3 — 2. Oxidation number of S in H₂S₂O₇ C. 4 — 3. Oxidation number of Ca in CaO₂ D. 6 — 4. Oxidation number of Al in NaAlH₄
(a)A-3, B-4, C-1, D-2
(b)A-4, B-3, C-1, D-2
(c)A-3, B-4, C-2, D-1
(d)A-4, B-3, C-2, D-1
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Not attemptedCorrect Answer: (a) A-3, B-4, C-1, D-2
The correct answer is (a). Ca in CaO₂ has oxidation number +2 (A-3), Al in NaAlH₄ has oxidation number +3 (B-4), Mn in MnO₂ has oxidation number +4 (C-1), and S in H₂S₂O₇ has oxidation number +6 (D-2).
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Frequently Asked Questions
What is the correct answer to this UPSC 2002 Science & Technology question?▼
The correct answer is option (a): A-3, B-4, C-1, D-2. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
Which year was this Chemistry question asked in UPSC Prelims?▼
This question was asked in UPSC CSE Prelims 2002, GS Paper 1, as Question 110. It falls under Science & Technology > Chemistry.
What is the difficulty level of this UPSC question?▼
This question is rated "hard". It is a challenging question that demands deep subject knowledge and analytical thinking.
How many UPSC Prelims questions have been asked from Chemistry?▼
UPSC has asked 53 questions from Chemistry (under Science & Technology) across multiple years. Visit the topic page to see the full list and year-wise trends.