300+ TOP MCQs on Oxidation Number and Oxidation State and Answers

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MCQs on Oxidation Number and Oxidation State :

1. Number of moles of K₂Cr₂O₇ reduced by 1 mole of Sn²⁺ is
(A) 1/6
(B) 1/3
(C) 2/3
(D) 1

Answer

Answer: (b)

2. The oxidation number of carbon in CH₂Cl₂ is
(A) 0
(B) 2
(C) 3
(D) 5

Answer

Answer: (a)

3. Which of the following will not be oxidised by O₃?
(A) KI
(B) FeSO₄
(C) KMnO₄
(D) K₂MnO₄

Answer

Answer: (c)

4. The oxidation state of chromium in the final product formed by the reaction between KI and acidified potassium dichromate solution is
(A) +4
(B) +6
(C) +2
(D) +3

Answer

Answer: (d)

5. What products are expected from the disproportionation reaction of hypochlorous acid?
(A) HCl and Cl₂O
(B) HCl and HClO₃
(C) HClO₃ and Cl₂O
(D) HClO₂ and HClO₄

Answer

Answer: (b)

6. Which of the following elements does not show disproportionation tendency?
(A) Cl
(B) Br
(C) F
(D) I

Answer

Answer: (c)

7. What is the oxidation number of chlorine in HClO₄?
(A) +3
(B) +5
(C) +7
(D) +8

Answer

Answer: (c)

8. The oxidation state of each Cl in CaOCl₂ is
(A) 0
(B) +1
(C) -1
(D) +1, -1

Answer

Answer: (d)

9. The products formed when an aqueous solution of NaBr is electrolysed in a cell having inert electrodes are
(A) Na and Br₂
(B) Na and O₂
(C) H₂, Br₂, NaOH
(D) H₂ and O₂

Answer

Answer: (c)

10. Number of moles of MnO₄^– required to oxidise one mole of ferrous oxalate completely in the acidic medium will be
(A) 7.5 moles
(B) 0.2 moles
(C) 0.6 moles
(D) 0.4 moles

Answer

Answer: (c)