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