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
Which of the following is the correct oxidation number of KOH (Fe) in hexacyanoferrate ion (Pe(CN⁶)⁴ I)?
- A.+2
- B.+3
- C.+4
- D.-2
Question 2 of 25
Which of the following is both an oxidising agent and a reducing agent?
- AH²O²
- BKClO³
- CKMnO⁴
- DHON³
Question 3 of 25
Oxidation is the process in which the valency of an element _______
- AIt decreases.
- Bincreases
- Cremains unchanged
- Dnone of these
Question 4 of 25
What is the process of combining with electropositive elements called?
- AOxidation
- Breduction
- Ccombustion
- Dtoothpaste
Question 5 of 25
The oxidation state of Mn in K²MnO⁴ is_
- A2
- B9
- C-2
- D6
Question 6 of 25
In the reaction ZnO + C Zn + CO, 'C' acts as which one of the following?
- Aacid
- Balkali
- Coxidant
- Dreducing agent
Question 7 of 25
The process of combining with electronegative elements or groups is called_
- AOxidation
- Breduction
- Cmotivation
- Dmotivation
Question 8 of 25
The tendency to gain electrons is called_
- AOxidation
- Breduction
- Ccatalysis
- Dmotivation
Question 9 of 25
In oxidation reduction reaction_
- AThe core electrons of the atom participate
- BThe valence electrons of an atom participate in
- CThe electrons of the first orbit of the atom participate in
- DThe nucleus of the atom participates in
Question 10 of 25
The oxidation state of Cr in KC² Cr² O² is_
- A6
- B-6
- C7
- D-7
Question 11 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 12 of 25
The tendency to lose electrons is called ____
- AOxidation
- Breduction
- Ccatalysis
- Dmotivation
Question 13 of 25
The oxidation state of sulphur in Na², S²O³ is_
- A.+2
- B.-2
- C.+3
- D.+4
Question 14 of 25
Which of the following substances is used as both an oxidising agent and a reducing agent?
- Asodium thiosulfate
- Bsodium nitrate
- Csodium nitrite
- Dsodium sulfide
Question 15 of 25
The oxidation state of oxygen in OF² is_
- A.+2
- B.-2
- C.+1
- D.-1
Question 16 of 25
Which of the following is the compound having +2 oxidation state of oxygen?
- AF²O
- BMnO²
- CH²0²
- DCO²
Question 17 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 18 of 25
The oxidation state of Mn in KMnO⁴ is_
- A.+2
- B.-2
- C.+7
- D.-7
Question 19 of 25
In the oxidation reaction, the ratio of electronegative element or group is ____
- Athere is a shortage
- BThere is an increase
- Cnever increasing
- Dnone of these
Question 20 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 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
The oxidation number of carbon in oxalic acid (H²,C²O⁴a) is_
- A.+4
- B.+2
- C.+3
- D.+1
Question 23 of 25
In oxidation, 1. hydrogen is displaced from a substance. 2. an electropositive element is added to a substance or the proportion of electropositive elements increases. Select the correct answer using the code given below.
- Aonly 1
- Bonly 2
- CBoth 1 and 2
- DNeither nor 2
Question 24 of 25
Rusting of iron is an example of what?
- AOxidation
- Breduction
- Cpolymerization
- DGalvanization
Question 25 of 25
In which of the following the oxidation state of chlorine is +1?
- ACl²O
- BHCI
- CICI
- DHCIO⁴