The loss of electron at the time of reaction by a molecule is known as oxidation and it gains positive charge. The atoms that lost electrons are said to be oxidized and atoms can be oxidized by nonmetal. The gain of electrons at the time of reaction by the molecule is known as reduction and its gaining of negative charge. The atom that acquired electrons is said to be reduced. When electrons are lost by one atom, they must be gained by another element. Therefore oxidation and reduction cannot occur alone. If one occurs, the other must occur also. Reactions involving oxidation and reduction are called redox. So take this quiz and check your knowledge on oxidation and reduction.
1. The oxidation number of carbon in the oxalate ion, C2O42- is..
A. +6
B. +4
C. +5
D. +7
2. The oxidation and reduction reactions are separated into chambers called __________.
A. +Ve-Cells
B. Half-Cells
C. Full-Cells
D. Zero-Cells
3. The oxidizing agent for the reaction is Al + MnO4- = Al(OH)4- + MnO2
A. Al3+
B. Al(OH)4-
C. MnO4-
D. MnO2
4. The oxidation number of C in HC2H3O2 is...
A. 0
B. 2
C. -2
D. 4
5. The __________ is an electrode where oxidation occurs..
A. Anode
B. Cathode
C. Electrode
D. All of the above
6. The oxidation-reduction reaction involves...
A. Transfer of neutrons
B. Transfer of protons
C. Transfer of electrons
D. None of above
7. Lead and Zinc metals occur naturally as?
A. Oxides
B. Sulphite ores
C. Carbon ores
D. Chloride ores
8. The strong reducing agent is ...
A. H2S
B. HCI
C. KMnO4
D. K2CrO4
9. Silver nitrate produces a black stain on the skin due to ...
A. Being strong reducing agent
B. Its corrosive action
C. Its reduction to metallic silver
D. None of these
10. Which one of the following is a strong oxidizing agent?
A. Copper
B. Dilute HNO3
C. Acidified K2Cr207
D. Al2O3
Drop your comment here...
