MCQs on Oxidation Reduction
1. The total of the oxidation number in an element is
(a) charge
(b) volatility
(c) reduction
(d) oxidation
Answer:::: (a)
2. The reduction is a gain of
(a) electrons
(b) protons
(c) neutros
(d) oxygen
Answer:::: (a)
3. Which of the following is not a reducing agent?
(a) CO2
(b) SO2
(c) NO2
(d) 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
(a) oxidation state only
(b) oxidation number
(c) oxidation degree only
(d) oxidation state and number
Answer:::: (d)
5. The gain of oxygen is known as
(a) oxidation
(b) reduction
(c) halogenation
(d) 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?
(a) S
(b) Cl
(c) H
(d) C
Answer:::: (b)
7. The oxidation number for oxygen will always be
(a) 2
(b) -2
(c) 1
(d) -1
Answer:::: (b)
8. The reduction is the decrease in
(a) oxidation number
(b) charge
(c) solubility
(d) none of the above
Answer:::: (a)
9. The reaction in which oxidation and reduction takes place at the same time is called
(a) redox reaction
(b) oxidation reaction
(c) reduction reaction
(d) none of the above
Answer:::: (a)
10. Hydrogen (H2) is used for making
(a) margarine only
(b) ammonia only
(c) salts
(d) margarine and ammonia
Answer:::: (d)
