Jamb Chemistry 1981 Past Questions and Answers

Question 11:

• JAMB 1981

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 12:

• JAMB 1981

the number of atoms in one mole of a substance is equal to?

A. The atomic number
B. The avogadro number
C. The gas constant
D. The number of neutrons
E. The number of electrons

Question 13:

• JAMB 1981

Which of the following statements is NOT true of electrovalent compounds?

A. They are solids
B. They do not vaporized easily
C. They usually dissolve in water
D. The elements forming the compounds normally have their valency electrons in a shared state
E. They conduct electricity

Question 14:

• JAMB 1981

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 15:

• JAMB 1981

In the reaction
C + 2HNO₃ → CO₂ + NO₂ + NO + H₂O nitric acid is acting as?

A. A reducing agent
B. A nitrating agent
C. An oxidizing agent
D. A catalytic agent
E. A neutralizing agent