Oxidation and Reduction: MCQ Test
25 questions · pick one option for each · submit when you finish to see your score and the correct answers.
Question 1 of 25
What is the process of combining with electropositive elements called?
- AOxidation
- Breduction
- Ccombustion
- Dtoothpaste
Question 2 of 25
In any reaction, oxidation/reduction
- AThere are different
- Bare together
- COxidation occurs first, then reduction
- DFirst there is reduction, then oxidation
Question 3 of 25
Rusting of iron is an example of what?
- AOxidation
- Breduction
- Cpolymerization
- DGalvanization
Question 4 of 25
Reduction is a chemical reaction in which-
- Aelectron is lost
- BOxygen combines with
- CThe proportion of electronegative groups increases
- Delectrons are captured
Question 5 of 25
In which of the following the oxidation state of chlorine is +1?
- ACl²O
- BHCI
- CICI
- DHCIO⁴
Question 6 of 25
Which one of the following chemical elements has the same oxidation state in all its compounds?
- ACarbon
- BFluorine
- Chydrogen
- Doxygen
Question 7 of 25
An oxidizing agent is a substance which ____
- Aincreases the oxidation number of the original element in a given substance
- BDecreases the oxidation number of the original element in a given substance
- Citself gets oxidized in a metabolic reaction
- Dloses electrons in a metabolic reaction
Question 8 of 25
In which oxidation state of chlorine is +1?
- Ahypochlorous acid
- Bhydrochloric acid
- CZinc Chloride
- Dchlorine
Question 9 of 25
The process of combining with electronegative elements or groups is called_
- AOxidation
- Breduction
- Cmotivation
- Dmotivation
Question 10 of 25
In the reaction of potassium permanganate with ferrous ammonium sulphate in ambient medium KMnO⁴, the change in oxidation state of Mn is_
- A.+5 to +2
- B.+6 to +2
- C.+7 to +2
- D.+7 to +3
Question 11 of 25
The oxidation state of oxygen in OF² is_
- A.+2
- B.-2
- C.+1
- D.-1
Question 12 of 25
The oxidation state of sulphur in Na², S²O³ is_
- A.+2
- B.-2
- C.+3
- D.+4
Question 13 of 25
The process associated with the burning of hydrogen is_
- Ahydration
- Breduction
- COxidation
- Dhydrogenation
Question 14 of 25
The oxidation state of Cr in KC² Cr² O² is_
- A6
- B-6
- C7
- D-7
Question 15 of 25
The tendency to gain electrons is called_
- AOxidation
- Breduction
- Ccatalysis
- Dmotivation
Question 16 of 25
The oxidation number of carbon in oxalic acid (H²,C²O⁴a) is_
- A.+4
- B.+2
- C.+3
- D.+1
Question 17 of 25
Which of the following is the strongest oxidising agent?
- Aoxygen
- Bchlorine
- CFluorine
- DIodine
Question 18 of 25
Which of the following statements regarding 'oxidation' and 'reduction' are correct? 1. Oxidation involves the loss of electrons, while reduction involves the gain of electrons. 2. Oxidation involves the gain of electrons, while reduction involves the loss of electrons. 3. An oxidizing agent lowers the oxidation point, but a reducing agent increases the oxidation point. 4. An oxidizing agent increases the oxidation point, but a reducing agent decreases the oxidation point. Select the correct answer using the code given below.
- Aand 3
- B2 and 4
- C2 and 3
- D1 and 4
Question 19 of 25
Which of the following is the compound having +2 oxidation state of oxygen?
- AF²O
- BMnO²
- CH²0²
- DCO²
Question 20 of 25
The tendency to lose electrons is called ____
- AOxidation
- Breduction
- Ccatalysis
- Dmotivation
Question 21 of 25
The oxidation number of nickel in K⁴(NI(CN)⁴,] is_
- AZero
- B.+4
- C.-4
- D.+8
Question 22 of 25
In the reaction ZnO + C Zn + CO, 'C' acts as which one of the following?
- Aacid
- Balkali
- Coxidant
- Dreducing agent
Question 23 of 25
Which of the following nitrogen oxides has the highest oxidation state of nitrogen?
- ANO
- BN²O⁵,
- CN²O
- DNO²
Question 24 of 25
Oxidation is a chemical reaction in which _______
- Aelectron is lost
- BOxygen combines with
- CThe proportion of electropositive groups increases
- DAll of the above
Question 25 of 25
Oxygen has a positive (+ve) oxygen number
- Ain op²
- BIn CI²O
- CH²O
- DN²O