Q. Which of the following compounds can act as an oxidizing agent?
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A.
NaCl
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B.
H2O
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C.
KMnO4
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D.
C6H12O6
Solution
KMnO4 is a strong oxidizing agent due to the presence of Mn in a high oxidation state.
Correct Answer: C — KMnO4
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Q. Which of the following elements can act as a reducing agent?
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A.
Cl2
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B.
H2O
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C.
Na
-
D.
O2
Solution
Sodium (Na) can act as a reducing agent as it can donate electrons.
Correct Answer: C — Na
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Q. Which of the following is a characteristic of a redox reaction?
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A.
Transfer of electrons
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B.
Formation of precipitate
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C.
Change in temperature
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D.
Change in color
Solution
Redox reactions are characterized by the transfer of electrons between species.
Correct Answer: A — Transfer of electrons
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Q. Which of the following is a common oxidizing agent?
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A.
H2O2
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B.
NaCl
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C.
CH4
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D.
C6H12O6
Solution
Hydrogen peroxide (H2O2) is a well-known oxidizing agent.
Correct Answer: A — H2O2
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Q. Which of the following is a reducing agent in the reaction 2CuO + C → 2Cu + CO2?
Solution
C is the reducing agent as it donates electrons to reduce CuO to Cu.
Correct Answer: B — C
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Q. Which of the following is an example of a disproportionation reaction?
-
A.
2H2O2 → 2H2O + O2
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B.
Zn + CuSO4 → ZnSO4 + Cu
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C.
2Na + Cl2 → 2NaCl
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D.
C + O2 → CO2
Solution
In the reaction 2H2O2 → 2H2O + O2, hydrogen peroxide is both oxidized and reduced.
Correct Answer: A — 2H2O2 → 2H2O + O2
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Q. Which of the following reactions is a redox reaction?
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A.
H2 + Cl2 → 2HCl
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B.
NaOH + HCl → NaCl + H2O
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C.
CaCO3 → CaO + CO2
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D.
C6H12O6 + 6O2 → 6CO2 + 6H2O
Solution
The combustion of glucose is a redox reaction where glucose is oxidized.
Correct Answer: D — C6H12O6 + 6O2 → 6CO2 + 6H2O
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Q. Which of the following species is reduced in the reaction 2MnO4- + 5C2O4^2- + 16H+ → 2Mn^2+ + 10CO2 + 8H2O?
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A.
MnO4-
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B.
C2O4^2-
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C.
H+
-
D.
CO2
Solution
In the given reaction, MnO4- is reduced to Mn^2+.
Correct Answer: A — MnO4-
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Q. Which of the following statements is true about redox reactions?
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A.
They always involve the transfer of protons.
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B.
They involve the transfer of electrons.
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C.
They do not involve changes in oxidation states.
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D.
They can only occur in acidic solutions.
Solution
Redox reactions involve the transfer of electrons between species.
Correct Answer: B — They involve the transfer of electrons.
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Q. Which of the following statements is true regarding redox reactions?
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A.
Oxidation involves gain of electrons.
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B.
Reduction involves loss of electrons.
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C.
Oxidizing agents are reduced.
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D.
Reducing agents are oxidized.
Solution
Oxidizing agents are reduced in redox reactions.
Correct Answer: C — Oxidizing agents are reduced.
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