NEET Chemistry Redox Reactions MCQs Set A

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MCQ for Full Syllabus Chemistry Redox Reactions

Full Syllabus Chemistry students should refer to the following multiple-choice questions with answers for Redox Reactions in Full Syllabus.

Redox Reactions MCQ Questions Full Syllabus Chemistry with Answers

 

 

Question: The process in which oxidation number increases is

  • a) Reduction
  • b) Hydrolysis
  • c) Oxidation
  • d) Decomposition

Answer: Oxidation

 

Question: The oxidation number of phosphorus vary from

  • a) – 3 to + 5
  • b) – 1 to + 1
  • c) – 3 to + 3
  • d) – 5 to + 1

Answer: – 3 to + 5

 

Question: Oxidation number of iodine varies from

  • a) – 1 to + 1
  • b) – 1 to + 7
  • c) + 3 to + 5
  • d) – 1 to + 5

Answer: – 1 to + 7

 

Question:  White P reacts with caustic soda, the products are PH3 and NaH2PO2 . The reaction is an example of

  • a) Oxidation
  • b) Reduction
  • c) Disproportionation
  • d) Neutralization

Answer: Disproportionation

 

Question:  Oxidation number of oxygen atom in O3 molecule is

  • a) 0
  • b) –2
  • c) + 2
  • d) – ½

Answer: 0

 

Question:  The oxidation number of C in CH4, CH3Cl, CH2Cl2, CHCl3 and CCl4 is respectively

  • a) –4, –2, 0, +2, +4
  • b) +2, 4, 0, –2, –4
  • c) 4, 2, 0, –2, 4
  • d) 0, 2, –2, 4, 4

Answer: –4, –2, 0, +2, +4

 

Question: Chlorine is in +3 oxidation number in

  • a) HCl
  • b) HClO4
  • c) ICl
  • d) ClF3

Answer:  ClF3

 

Question: Given that the oxidation number of sulphur is –2, the equivalent weight of sulphur is

  • a) 16
  • b) 32
  • c) 9
  • d) 4

Answer: 16

 

Question: In a reaction between zinc and iodine, zinc iodide is formed. Which is being oxidised?

  • a) Zinc ions
  • b) Iodide ions
  • c) Zinc atom
  • d) Iodine

Answer: Zinc atom

 

Question:  In the following equation

NEET Chemistry Redox Reactions Online Test Set A-10

  • a) Bromine is oxidised and carbonate is reduced
  • b) Bromine is reduced and carbonate is oxidised
  • c) Bromine is neither reduced nor oxidised
  • d) Bromine is reduced as well oxidised

Answer: Bromine is reduced as well oxidised

 

Question: In which reaction, there is change in oxidation number of N atom?

  • a)

    NEET Chemistry Redox Reactions Online Test Set A-11-1

  • b)

    NEET Chemistry Redox Reactions Online Test Set A-11-2

  • c)

    NEET Chemistry Redox Reactions Online Test Set A-11-3

  • d)

    NEET Chemistry Redox Reactions Online Test Set A-11-4

Answer:

NEET Chemistry Redox Reactions Online Test Set A-11-2

 

Question:  When iron is added to CuSO4 solution, copper is precipitated. It is due to

  • a) Oxidation of Cu+2
  • b) Reduction of Cu+2
  • c) Hydrolysis of CuSO
  • d) Ionization of CuSO4

Answer:  Reduction of Cu+2

 

More Questions........................................................

 

Question: Which of the following reactions involves oxidation and reduction?

  • a)

    NEET Chemistry Redox Reactions Online Test Set A-13-1

  • b)

    NEET Chemistry Redox Reactions Online Test Set A-13-2

  • c)

    NEET Chemistry Redox Reactions Online Test Set A-13-3

  • d)

    NEET Chemistry Redox Reactions Online Test Set A-13-4

Answer:

NEET Chemistry Redox Reactions Online Test Set A-13-3

 

Question:  The oxidation number of sulphur in H2S2O8 is

  • a) + 7
  • b) + 6
  • c) – 6
  • d) + 4

Answer: + 6

 

Question: Which one of the following is the correct match?

  • a) Cl2- only reducing agent
  • b) HNO2- only oxidising agent
  • c) HNO3- both oxidising and reducing agent
  • d) SO2- both oxidising and reducing agent

Answer: SO2- both oxidising and reducing agent

 

Question:  The brown ring complex compound is formulated as [Fe(H2O)5NO]SO4 . The oxidation state of iron is

  • a) +1
  • b) + 2
  • c) + 3
  • d) + 6

Answer: +1

 

Question: Phosphorus has the oxidation state + 3 in

  • a) Orthophosphoricacid    (H3PO4)  
  • b) Phosphorus acid    (H3PO3)
  • c) Metaphosphoric acid    (HPO3
  • d) Pyrophosphoric acid    (H4P2O7)

Answer: Phosphorus acid    (H3PO3)

 

Question: Given that the oxidation number of sulphur is –2, the equivalent weight of sulphur is

  • a) 16
  • b) 32
  • c) 9
  • d) 4

Answer: 16

 

Question:  Oxidation number of Cr in CrO5  is

  • a) + 10
  • b) + 6
  • c) + 4
  • d) + 5

Answer: + 6

 

Question: In which of the following compounds iron has lowest oxidation number?

  • a) FeSO4· (NH4)2SO4· 6H2
  • b) K4[Fe(CN)6
  • c) Fe2O
  • d) Fe2O3

Answer: Fe2O

 

Question: In which of the following compounds, the oxidation number of iodine is fractional?

  • a) IF7
  • b) I3
  • c) IF5
  • d) IF3

Answer: I3

 

Question: Which reaction involves neither oxidation nor reduction?

  • a)

    NEET Chemistry Redox Reactions Online Test Set A-22-1

  • b)

    NEET Chemistry Redox Reactions Online Test Set A-22-2

  • c)

    NEET Chemistry Redox Reactions Online Test Set A-22-3

  • d)

    NEET Chemistry Redox Reactions Online Test Set A-22-4

Answer:

NEET Chemistry Redox Reactions Online Test Set A-22-1

 

Question:  In the chemical reaction,

NEET Chemistry Redox Reactions Online Test Set A-23

a, b and c are

  • a) 1, 3, 1
  • b) 4, 1, 4
  • c) 3, 2, 3
  • d) 2, 1, 2

Answer: 1, 3, 1

 

Question: Oxidation number of sodium in sodium 3 amalgam is

  • a) +1
  • b) 0
  • c) –1
  • d) +2

Answer: 0

 

Question:  Which of the following compound cannot be oxidised by O3?

  • a) KI
  • b) KMnO4
  • c) K2MnO4 
  • d) FeSO4

Answer: KMnO4

 

Question:  In alkaline solution KMnO4 reacts as follows

NEET Chemistry Redox Reactions Online Test Set A-26

Therefore, its equivalent weight will be

  • a) 31.6
  • b) 52.7
  • c) 79.0
  • d) 158.0

Answer: 158.0

 

Question:  The equivalent weight of FeS2 in the following reaction is

  • a)

    NEET Chemistry Redox Reactions Online Test Set A-27-1

  • b)

    NEET Chemistry Redox Reactions Online Test Set A-27-2

  • c)

    NEET Chemistry Redox Reactions Online Test Set A-27-3

  • d)

    NEET Chemistry Redox Reactions Online Test Set A-27-4

Answer:

NEET Chemistry Redox Reactions Online Test Set A-27-3

 

Question:  When SO2 is passed in acidified potassium dichromate solution, the oxidation number of S is changed from

  • a) + 4 to zero
  • b) + 4 to + 2
  • c) + 4 to + 6
  • d) + 6 to + 4

Answer: + 4 to + 6

 

Question:  How many mole of FeSO4 reacted with one mole of KMnO4 in acidic medium?

  • a)

    NEET Chemistry Redox Reactions Online Test Set A-30

  • b) 5
  • c)

    NEET Chemistry Redox Reactions Online Test Set A-30-3

  • d)

    NEET Chemistry Redox Reactions Online Test Set A-30-4

Answer: 5

 

Question: A compound of Xe and F is found to have 53.3% Xe (At. mass = 133). Oxidation number of Xe in this compound is

  • a) +2
  • b) 0
  • c) +4
  • d) +6

Answer: +6

 

Question: Which of the following is not correct for electrochemical cell?

  • a) Convert chemical energy to electrical energy
  • b) Anode is –ve terminal
  • c) Cathode is –ve terminal
  • d) Cathode is +ve terminal

Answer: Cathode is –ve terminal

 

Question: Which of the following is not a redox reaction?

  • a)

    NEET Chemistry Redox Reactions Online Test Set B

  • b)

    NEET Chemistry Redox Reactions Online Test Set B-2

  • c) Photosynthesis
  • d) Cell respiration

Answer:

NEET Chemistry Redox Reactions Online Test Set B-2

 

Question: Redox reaction have no concern with

  • a) Neutralization of acid bases
  • b) Salt hydrolysis
  • c) Esterification
  • d) All of these

Answer: All of these

 

Question: In the process of photosynthesis, which takes place in green plants which undergoes reduction?

  • a) Water
  • b) CO2  
  • c) Protons
  • d) Photons

Answer:  CO2

 

Question:

NEET Chemistry Redox Reactions Online Test Set B-34

n factor of nitrobenzene in this process

  • a) 3
  • b) 6
  • c) 2
  • d) 4

Answer: 6

 

Question:  The ratio of number of moles of KMnO4 and K2Cr2O7 required to oxidise 0.1 mol Sn2+ to Sn+4 in acidic medium

  • a) 6 : 5
  • b) 5 : 6
  • c) 1 : 2
  • d) 2 : 1

Answer: 5 : 6

 

Question:

NEET Chemistry Redox Reactions Online Test Set B-Q2

The equivalent mass of Cl2 in the above reaction is

  • a) M
  • b)

    NEET Chemistry Redox Reactions Online Test Set B-Q2-2

  • c)

    NEET Chemistry Redox Reactions Online Test Set B-Q2-3

  • d)

    NEET Chemistry Redox Reactions Online Test Set B-Q2-4

Answer:

NEET Chemistry Redox Reactions Online Test Set B-Q2-4

 

Question: KCl is used as an electrolyte in salt bridge because

  • a) K+ and Cl are isoelectronic 
  • b) Monovalent ions are required
  • c) Both the ions have almost same velocity
  • d) They are having similar size

Answer: Both the ions have almost same velocity

 

Question: Electrode potential depends upon

  • a) Size of electrode
  • b) Surface area of electrode
  • c) Temperature
  • d) Shape of electrode

Answer: Temperature

 

Question:  EMF of the given cell

NEET Chemistry Redox Reactions Online Test Set B-Q4

  • a) 2.8 V
  • b) 1.8 V
  • c) 0 V
  • d) –1.8 V

Answer: 2.8 V

 

Question:  Oxidation number of Cr atom in CrO5 and K3CrO8 respectively

  • a) +6, +6
  • b) +5, +6
  • c) +6, +5
  • d) +5, +5

Answer: +6, +5

 

Question:  Number of electrons involved in the reaction when 0.1 mol NH3 dissolved in water

  • a) 2
  • b) 0.4
  • c) 0.9
  • d) Zero

Answer: Zero

 

Question:

NEET Chemistry Redox Reactions Online Test Set B-Q8

Electrode potential for given reaction

NEET Chemistry Redox Reactions Online Test Set B-Q8-

  • a) 3.02 V
  • b) 6.04 V
  • c) 1.5 V
  • d) –3.02 V

Answer: 3.02 V

 

Question: Three metals A, B and C are arranged in increasing order of standard reduction electrode potential, hence their chemical reactivity order will be

  • a) A < B < C
  • b) A > B > C
  • c) B > C > A
  • d) A = B = C

Answer: A > B > C

 

Question: Find the incorrect statement

  • a) Higher reduction potential of non-metal means stronger reducing agent
  • b) Lower oxidation potential of a metal means strong oxidising agent
  • c) Oxidation state of oxygen in O3 is –1
  • d) All of these

Answer: All of these

 

Question: When an alkali metal is reacted with hydrogen then metallic hydride is formed. In this reaction

  • a) Hydrogen is oxidised
  • b) Hydrogen is reduced
  • c) Hydrogen is neither oxidised nor reduced
  • d) Hydrogen is oxidised as well as reduced

Answer: Hydrogen is reduced

 

Question:  In case of CH3COOH, the oxidation number of carbon of carboxylic group is

  • a) –3
  • b) Zero
  • c) +1
  • d) +3

Answer: +3

 

Question:  How many moles of KMnO4 are required to oxidise one mole of SnClin acidic medium?

  • a) 1/5
  • b) 2/5
  • c) 3/5
  • d) 4/5

Answer: 2/5

 

Question: Which compound acts as oxidising agent only?

  • a) SO2
  • b) H2S
  • c) H2SO4
  • d) HNO2

Answer: H2SO4

 

Question: The average oxidation state of chlorine in bleaching powder is

  • a) –1
  • b) +1
  • c) Zero
  • d) –2 as well as +2

Answer: Zero

 

Question: When benzaldehyde is oxidised to give benzoic acid then the oxidation state of carbon of aldehydic group is changed from

  • a) +2 to +3
  • b) +1 to +3
  • c) Zero to +2
  • d) No change

Answer: +1 to +3

 

Question: Which of the following is incorrect regarding salt bridge solution?

  • a) Solution must be a strong electrolyte
  • b) Solution should be inert towards both electrodes
  • c) Size of cations and anions of salt should be much different
  • d) Salt bridge solution is prepared in gelatin or agar-agar to make it semi-solid

Answer: Size of cations and anions of salt should be much different

 

Question:  Standard electrode potentials of redox couples A2+/A, B2+/B, C/C2+ and D2+/D are 0.3 V, –0.5 V, –0.75 V and 0.9 V respectively. Which of these is best oxidising agent and reducing agent respectively?

  • a) D2+/D and B2+/B 
  • b) B2+/B and D2+/D 
  • c) D2+/D and C2+/C
  • d) C2+/C and D2+/D

Answer: D2+/D and B2+/B 

 

Question:  The number of moles of H2O2 required to completely react with 400 ml of 0.5 N KMnOin acidic medium are

  • a) 0.1
  • b) 0.2
  • c) 1.0
  • d) 0.5

Answer: 0.1

 

Question:

NEET Chemistry Redox Reactions Online Test Set B-Q20

The coefficient X, Y and Z are

  • a) 6, 2, 2
  • b) 5, 1, 3
  • c) 12, 2, 6
  • d) 12, 1, 6

Answer: 12, 2, 6

 

Question: Which of the following processes does not involve oxidation of iron?

  • a) Liberation of H2 from steam by iron at high temperature  
  • b) Rusting of iron sheets
  • c) Decolourization of blue CuSO4 solution by iron
  • d) Formation of Fe(CO)5 from Fe

Answer:   Formation of Fe(CO)5 from Fe

 

Question:

NEET Chemistry Redox Reactions Online Test Set B-Q2-

Role of hydrogen peroxide in the above reactions is respectively 

  • a) Oxidizing in (a) and reducing in
  • b) Reducing in (a) and oxidizing in (b)
  • c) Reducing in (a) and (b)
  • d) Oxidizing in (a) and (b)

Answer: Reducing in (a) and (b)

 

Question: In which of the following compounds, nitrogen exhibits highest oxidation state?

  • a) N3H
  • b) NH2OH
  • c) N2H4
  • d) NH3

Answer: N3H

 

Question:  Oxidation states of P in H4P2O5, H4P2O6, H4P2O7 are respectively 

  • a) +3, +5, +4
  • b) +5, +3, +4
  • c) +5, +4, +3
  • d) +3, +4, +5

Answer: +3, +4, +5

 

Question:  Oxidation numbers of P in 

NEET Chemistry Redox Reactions Online Test Set B-Q6 are respectively

  • a) + 3, + 6 and + 5
  • b) + 5, + 3 and + 6
  • c) – 3, + 6 and + 6
  • d) + 5, + 6 and + 6

Answer: + 5, + 6 and + 6

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MCQs for Redox Reactions Chemistry Full Syllabus

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