MCQs on Oxidation Number and Oxidation State

MCQs on Oxidation Number and Oxidation State

1. Number of moles of K₂Cr₂O₇ reduced by 1 mole of Sn²⁺ is

1. 1/6
2. 1/3
3. 2/3
4. 1

Answer: (b)

2. The oxidation number of carbon in CH₂Cl₂ is

1. 0
2. 2
3. 3
4. 5

Answer: (a)

3. Which of the following will not be oxidised by O₃?

1. KI
2. FeSO₄
3. KMnO₄
4. K₂MnO₄

Answer: (c)

4. The oxidation state of chromium in the final product formed by the reaction between KI and acidified potassium dichromate solution is

1. +4
2. +6
3. +2
4. +3

Answer: (d)

5. What products are expected from the disproportionation reaction of hypochlorous acid?

1. HCl and Cl₂O
2. HCl and HClO₃
3. HClO₃ and Cl₂O
4. HClO₂ and HClO₄

Answer: (b)

6. Which of the following elements does not show disproportionation tendency?

1. Cl
2. Br
3. F
4. I

Answer: (c)

7. What is the oxidation number of chlorine in HClO₄?

1. +3
2. +5
3. +7
4. +8

Answer: (c)

8. The oxidation state of each Cl in CaOCl₂ is

1. 0
2. +1
3. -1
4. +1, -1

Answer: (d)

9. The products formed when an aqueous solution of NaBr is electrolysed in a cell having inert electrodes are

1. Na and Br₂
2. Na and O₂
3. H₂, Br₂, NaOH
4. H₂ and O₂

Answer: (c)

10. Number of moles of MnO₄^– required to oxidise one mole of ferrous oxalate completely in the acidic medium will be

1. 7.5 moles
2. 0.2 moles
3. 0.6 moles
4. 0.4 moles

Answer: (c)