Oxidation-Reduction reactions are reactions that involve the transfer of electrons between chemical species. A simple definition of redox reactions considers oxidation as the gain of oxygen atoms and reduction as the loss of oxygen atoms. A redox reaction can also be defined as a reaction in which some of the elements undergo a change in oxidation number. The oxidising agent is by definition the substance containing the atom which shows a decrease in oxidation number. Redox reactions are electron transfers by definition.
1. The total of the oxidation number in an element is
- charge
- volatility
- reduction
- oxidation
Answer: (a)
2. The reduction is a gain of
- electrons
- protons
- neutros
- oxygen
Answer: (a)
3. Which of the following is not a reducing agent?
- CO2
- SO2
- NO2
- ClO2
Answer: (a)
4. A number which is assigned to each atom or ion in a compound which explains its degree of oxidation is called
- oxidation state only
- oxidation number
- oxidation degree only
- oxidation state and number
Answer: (d)
5. The gain of oxygen is known as
- oxidation
- reduction
- halogenation
- chlorination
Answer: (a)
6. Which of the following undergoes a maximum change in its oxidation number, when a mixture of oxalic acid, potassium chlorate and sulphuric acid is heated?
- S
- Cl
- H
- C
Answer: (b)
7. The oxidation number for oxygen will always be
- 2
- -2
- 1
- -1
Answer: (b)
8. The reduction is the decrease in
- oxidation number
- charge
- solubility
- none of the above
Answer: (a)
9. The reaction in which oxidation and reduction takes place at the same time is called
- redox reaction
- oxidation reaction
- reduction reaction
- none of the above
Answer: (a)
10. Hydrogen (H2) is used for making
- margarine only
- ammonia only
- salts
- margarine and ammonia
Answer: (d)
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