Oxidation And Reduction In Terms Of Electron Transfer Jamb Chemistry Past Questions
Question 16
What are the possible oxidation numbers of an element if its atomic number is 17?
- A. -1 and 7
- B. -1 and 6
- C. -3 and 5
- D. -2 and 6
Question 17
Oxidation is the process of?
- A. gain of electrons
- B. loss of electrons
- C. gain of hydrogen
- D. loss of oxygen
- E. addition of an electropositive element to a substance
Question 18
If concentrated sulphric acid is added to sugar and warmed gently, the sugar changes from white to brown and finally to a black mas of carbon. In this reaction, concentrated sulphuric acid is acting as ?
- A. a drying agent
- B. an oxidizing agent
- C. a dehydrated agent
- D. a reducing agent
- E. a hydrolysing agent
Question 19
Which of the following equations represents an oxidizing action of sulphur dioxide?
- A. SO2 + 2HNO2 → H2SO4 + 2NO2 + heat
- B. 2SO2 + 2H2O + O2 → 2H2SO4
- C. SO2 + 2H2O + CI2 → H2SO4 + 2HCI
- D. SO2 + 2H2S → 3S + 2H2O
- E. K2Cr2O7 + H2SO4 + 3SO2 → K2SO4 + Cr2(SO4)3 + H2O
Question 20
2MnO-4 + 10Cl- + 16H+ → 2Mn2+ + 5Cl2 + 8H2O. Which of the substances serves as an oxidizing agent?
- A. Mn2+
- B. Cl-
- C. H2O
- D. MnO-4
- E. Cl2
