CBSE Class 11 Chemistry Redox Reactions MCQs

Question: Which of the following process takes place in oxidation process?

• a) Addition of oxygen
• b) Addition of hydrogen
• c) Addition of chlorine
• d) Removal of oxygen

Answer: Addition of oxygen

Question: The loss of electron is termed as

• a) oxidation
• b) reduction
• c) combustion
• d) neutralization

Answer: oxidation

Question: When a strip of metallic zinc is placed in an aqueous solution of copper nitrate the blue colour of the solution disappear due to formation of

• a) Zn²⁺
• b) Cus
• c) ZnS
• d) Cu²⁺

Answer: Zn²⁺

Question: The correct order of electron releasing tendency of the metals Cu, Zn and Ag is in the order

• a) Zn > Cu > Ag
• b) Zn > Ag > Cu
• c) Cu > Zn > Ag
• d) Ag > Zn > Cu

Answer: Zn > Cu > Ag

Question: What is the oxidation number of elements in the free or in the uncombined state ?

• a) 0
• b) –1
• c) +1
• d) +2

Answer: 

Question: ‘Oxidation number of H in NaH, CaH₂ and LiH, respectively is

• a) –1,–1, –1
• b) –1, +1, + 1
• c) +1, +1, –1
• d) +1, + 1, + 1

Answer: –1,–1, –1

Question: Which of the following is the correct representative of stock notation for auric chloride?

• a) Au(III)Cl₃
• b) Au(II)Cl₂
• c) Au(I)Cl₂
• d) None of these

Answer: Au(III)Cl₃

Question: Oxidation number of N in HNO₃ is

• a) + 5
• b) + 3.5
• c) – 3.5
• d) –5

Answer: + 5

Question: The oxidation number of chromium in potassium dichromate is

• a) + 6
• b) – 5
• c) – 2
• d) + 2

Answer: + 6

Question: Oxidation number of cobalt in K[Co(CO)₄] is

• a) –3
• b) +3
• c) +1
• d) –1

Answer: –3

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

Question: Oxidation number of carbon in CH₂Cl₂ is

• a) 0
• b) –4
• c) +4
• d) –2

Answer: 

Question: The oxidation state of osmium (Os) in OsO₄ is

• a) +8
• b) +6
• c) +7
• d) +4

Answer: +8

Question: Which of the following transition metal has zero oxidation state ?

• a) [Fe(CO)₅]
• b) NOClO₄
• c) NH₂.NH₂
• d) CrO₅

Answer: [Fe(CO)₅]

Question: In which of the compounds does 'manganese' exhibit highest oxidation number ?

• a) KMnO₄
• b) MnO₂
• c) Mn₃O₄
• d) MnSO₄

Answer: KMnO₄

Question: A metal ion M³⁺ loses 3 electrons, its oxidation number will be

• a) +6
• b) –3
• c) +3
• d) 0

Answer: +6

Question: The correct name for NO₂ using stock notation is

• a) nitrogen (iv) oxide
• b) All of these
• c) nitrogen dioxide
• d) nitrogen per oxide

Answer: nitrogen (iv) oxide

Question: The oxide, which cannot act as a reducing agent, is

• a) CO₂
• b) NO₂
• c) SO₂
• d) ClO₂

Answer: CO₂

Question: The oxidation state of Fe in Fe₃O₄ is

• a) 8/3
• b) + 2
• c) + 3
• d) + 6

Answer: 8/3

Question: In oxygen difluoride, the oxidation number of oxygen is

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

Answer: + 2

Question: Oxygen has an oxidation state of +2 in the compound

• a) F₂O
• b) None of these
• c) CO₂
• d) H₂O

Answer: F₂O