MCQs on Redox Reaction
1. Which of the compounds can exist together?
A.HgCl2, SnCl2
B. FeCl3, KI
C. FeCl3, SnCl2
D. FeCl2, SnCl2
Answer:::: D.
2. One mole of ferrous oxalate requires____ moles of MnO4– to get oxidised completely in an acidic medium
A.0.6 moles
B. 0.4 moles
C. 0.2 moles
D. 7.5 moles
Answer:::: B.
3. H2O2 changes Cr2O72- ion to CrO5 in an acidic medium, the oxidation state of Cr in CrO5 is
A.+6
B. +5
C. -10
D. +3
Answer:::: A
4. H2SO4 acts as a strong oxidising agent. In which of the reaction, is it not acting as an oxidising agent?
A.C + 2H2SO4 → CO2 + 2SO2 + 2H2O
B. CaF2 + 2H2SO4 → CaSO4 + 2HF
C. S + 2H2SO4 → 3SO2 + H2O
D. Cu + 2H2SO4 → CuSO4 + SO2 + 2H2O
Answer:::: B.
5. During a reaction of oxalic acid, potassium chlorate and sulphuric acid, the oxidation number of which of the element undergoes a maximum change
A.H
B. S
C. C
D. Cl
Answer:::: D.
6. Find the redox reaction
A.In the atmosphere, O3 from O2 by lighting
B. The reaction of H2SO4 with NaOH
C. Both oxidation and reduction reaction
D. Evaporation of water
Answer:::: C.
7. Find the oxidation state of I in H4IO6–
A.+7
B. +5
C. +1
D. -1
Answer:::: A
8. In which of the following complex, the oxidation number of Fe is +1?
A.Fe4[Fe(CN)6]3
B. [Fe(H2O)5NO]SO4
C. [FeBr4]–
D. [Fe(H2O)6]2-
Answer:::: B.
9. Which among the following compounds is the most reducing compound?
A.H2S
B. HNO2
C. SnCl2
D. H2SO3
Answer:::: A
10. Which among the following is the strongest oxidising agent?
A.H2O2
B. O3
C. K2Cr2O7
D. KMnO4
Answer:::: B.
