Redox Reactions Multiple Choice Questions

Redox Reactions Multiple Choice Questions

Question 1. A compound contains elements X, Y, and Z with oxidation numbers +3, +5, and -2 respectively. The possible formula of a compound containing these elements is

1. XYZ2
2. Y2(XZ3)2
3. X3(YZ4)3
4. X3(Y4Z)2

Answer: 3. X3(YZ4)3

Question 2. In which of these compounds does chlorine display a positive oxidation number?

1. HC₁
2. HOC₁
3. BrCl3
4. NaC₁

Answer: 2. HOC₁

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Question 3. If a metal cation M3+ gains three electrons its oxidation number will become

1. +6
2. -3
3. 0
4. +3

Answer: 3. 0

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Question 4. In which of the following compounds does Cr display the highest oxidation state?

1. Cr203
2. CrCl3
3. Cr(OH)2
4. K2Cr04

Answer: 4. K2Cr04

Question 5. Which of the following will reduce Ag+ to Ag but not Niz+ to Ni?

1. Fe
2. Fb
3. Be
4. Zn

Answer: 2. Fb

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Question 6. The oxidized form of MnOz is

1. Mn²⁺
2. MnO-4
3. MnO-4
4. Mn(OH)4

Answer: 2. MnO-4

Question 7. Which of these is a redox reaction?

\(\mathrm{NaOH}+\mathrm{HCl} \longrightarrow \mathrm{NaCl}+\mathrm{H}_2 \mathrm{O}\) \(\mathrm{AgNO}_3+\mathrm{NaCl} \longrightarrow \mathrm{AgCl}+\mathrm{NaNO}_3\) \(\mathrm{Zn}+\mathrm{H}_2 \mathrm{SO}_4 \longrightarrow \mathrm{ZnSO}_4+\mathrm{H}_2\) \(\mathrm{FeSO}_4+2 \mathrm{H}_2 \mathrm{O} \longrightarrow \mathrm{Fe}(\mathrm{OH})_2+\mathrm{H}_2 \mathrm{SO}_4\)

Answer: 3. \(\mathrm{Zn}+\mathrm{H}_2 \mathrm{SO}_4 \longrightarrow \mathrm{ZnSO}_4+\mathrm{H}_2\)

Question 8. In which of these compounds does carbon have a negative oxidation number?

1. CH₄
2. CH₂Cl₂
3. CCl₄
4. HCHO

Answer: 1. CH₄

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Question 9. Consider the reaction

⇒ \(\mathrm{Zn}+\mathrm{Cu}^{2+} \longrightarrow \mathrm{Zn}^{2+}+\mathrm{Cu}\)

Which of the following is the correct statement?

1. Zn is reduced to Zn²⁺
2. Cu²⁺ is oxidized to Cu.
3. Zn is oxidized to Zn²⁺
4. Zn is the oxidizing agent

Answer: 3. Zn is oxidized to Zn²⁺

Question 10. What is the oxidation state of N in Mg3N2?

⇒ \(\mathrm{NaClO}_3 \longrightarrow \mathrm{NaClO}+2 \mathrm{NaCl}\)

1. -3
2. -2
3. +3
4. -1

Answer: 1. -3

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Question 11. In the following reaction which element loses as well as gains electrons?

⇒ \(\mathrm{NaClO}_3 \longrightarrow \mathrm{NaClO}+2 \mathrm{NaCl}\)

1. Na
2. Cl
3. O
4. The reaction is Not Feasible.

Answer:

Question 12. In the redox reaction shown here, what are the coefficients x and y?

⇒ \(y \mathrm{SnCl}_2+x \mathrm{FeCl}_3 \longrightarrow y \mathrm{SnCl}_4+x \mathrm{FeCl}_2\)

1. 2,1
2. 1,1
3. 1,3
4. 1,2

Answer: 1. 2,1

Question 13. What is the value of x in the following half-reaction?

⇒ \(\mathrm{C}_2 \mathrm{O}_7^{2-}+4 \mathrm{H}^{+}+x \mathrm{e}^{-} \longrightarrow 2 \mathrm{Cr}^{3+}+7 \mathrm{H}_2 \mathrm{O}\)

1. 6
2. 5
3. 2
4. 4

Answer: 1. 6

Question 14. The oxidation number of Os in 0s04 is

1. +4
2. +6
3. +2
4. +8

Answer: 4. +8

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Question 15. Which of these is a disproportionation reaction?

1. \(2 \mathrm{CuCl} \longrightarrow \mathrm{CuCl}_2+\mathrm{Cu}\)
2. \(\mathrm{CaCO}_3 \longrightarrow \mathrm{CaO}+\mathrm{CO}_2\)
3. \(2 \mathrm{~Pb}\left(\mathrm{NO}_3\right)_2 \rightarrow \mathrm{PbO}+4 \mathrm{NO}_2+\mathrm{O}_2\)
4. \(\mathrm{PCl}_5 \rightarrow \mathrm{PCl}_3+\mathrm{Cl}_2\)

Answer: 1. \(2 \mathrm{CuCl} \longrightarrow \mathrm{CuCl}_2+\mathrm{Cu}\)

Question 16. The oxidation number of Fe in Fe304 is

1. \(-\frac{8}{3}\)
2. \(+\frac{8}{3}\)
3. \(-\frac{2}{3}\)
4. \(+\frac{2}{3}\)

Answer: 2. \(+\frac{8}{3}\)

Question 17. Which of the following gases is not a reducing agent?

1. SO₂
2. NO₂
3. CO₂
4. CO

Answer: 3. CO₂

Question 18. Which of these would be an alternative for A in the given reaction?

⇒ \(2 \mathrm{H}_2 \mathrm{~S}+\mathrm{SO}_2 \longrightarrow 2 \mathrm{H}_2 \mathrm{O}+\mathrm{A}\)

1. S
2. SO₃
3. H₂SO₃
4. H₂SO₄

Answer: 1. S

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Question 19. Which is the oxidizing agent in the given reaction?

⇒ \(\mathrm{Cl}_2+2 \mathrm{Br}^{-} \longrightarrow \mathrm{Br}_2+2 \mathrm{Cl}^{-}\)

1. Br-
2. Cl₂
3. Br₂
4. Cl-

Answer: 2. Cl₂

Question 20. When a Cu rod is dipped in a beaker containing an AgNO solution, what change occurs in the tire color of the solution?

1. Terms
2. Turns blue
3. No change
4. Turns black

Answer: 1. Turms

Question 21. The reaction \(3 \mathrm{ClO}^{-} \longrightarrow \mathrm{ClO}_3^{-}+2 \mathrm{Cl}^{-}\) is an example of

1. Oxidation
2. Reduction
3. Displacement
4. Disproportionation

Answer: 4. Disproportionation

Question 22. The oxidation number of N in NH is

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

Answer: 4. +3

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Question 23. Which of the following is not possible?

1. Keeping a zinc sulfate solution in a copper vessel
2. Keeping a zinc sulfate solution in a silver vessel
3. Keeping a copper sulfate solution in a zinc vessel
4. Keeping a copper sulfate solution in a silver vessel

Answer: 3. Keeping a copper sulfate solution in a zinc vessel

Question 24. In which of these compounds does S show the highest oxidation state?

1. H₂SO₃
2. H₂SO₄
3. H₂S
4. SO₂

Answer: 2. H₂SO₄