Jamb Chemistry Past Questions and Answers

Question 216:

• JAMB 1981

Sodium and potassium belong to the same group of the Periodic Table. This is because?

A. Both are metals
B. Both are soft and lighter than water
C. Both form cations by losing electrons
D. Both have identical electronic configuration
E. Both react with water vigorously

Question 217:

• 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 218:

• 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 219:

• 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 220:

• 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