O Level Chemistry – More Questions on REDOX

Now, let us continue with more exam-based questions on REDOX itself.

For those looking for more questions to practice for upcoming major examinations, you are going to enjoy this.

Question 1:
In which of the following reactions is the underlined substance reduced?
A. Cl2 + 2I– –> 2Cl- + I2
B. Zn + H2SO4 –> ZnSO4 + H2
C. Fe2+ + H2O2 –> Fe3+ + H2O
D. CuO + H2 –> Cu + H2O

Question 2:
Which conversion involves the smallest change in oxidation number of the underlined element?
A. C(s) –> CO2
B. NO3-(aq) –> NO2(g)
C. SO32-(aq) –> SO42-(aq)
D. MnO4-(aq) –> Mn2+(aq)

Question 3:
The oxidation states of chlorine in ClO4- and Cl2O are respectively
A. +1 and +3
B. +3 and +7
C. +7 and +1
D. +7 and +2

Question 4:
Which statement is true about oxidizing agents?
A. Their oxidation state is zero
B. They are easily oxidized
C. They never contain hydrogen
D. They readily accept electrons

Question 5:
What does an oxidizing agent do?
A. It turns acidified potassium dichromate (VI) green
B. It turns potassium manganate (VII) colorless
C. It turns Universal Indicator red
D. It turns aqueous potassium iodide brown

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Related Articles:

• O Level Chemistry Question: Redox Reaction
• O Level Chemistry: Redox Reaction Question 3
• O Level Chemistry: Redox Reactions
• O Level Chemistry – Qualitative Analysis
• O Level Chemistry: Redox Reaction Question 5