Q. The correct decreasing order of oxidation state of the underlined atom in each molecule is (the underlined atom is shown in brackets after each formula)
A) P₄O₆ (P) > Cl₂O₇ (Cl) > AlH₃ (Al)
B) P₄O₁₀ (P) > SO₃ (S) > H₂O (O)
C) N₂O₅ (N) > Al₂O₃ (Al) > H₂S (S)
D) PbO₂ (Pb) > N₂O₃ (N) > SO₃ (S)
Explanation
[Solution from source] N in N₂O₅ is +5, Al in Al₂O₃ is +3 and S in H₂S is −2, a strictly decreasing sequence. In the others: Cl in Cl₂O₇ is +7 > P in P₄O₆ (+3); S in SO₃ (+6) > P in P₄O₁₀ (+5); S in SO₃ (+6) > Pb in PbO₂ (+4). Answer (3).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.