Jamb Chemistry 2004 Past Questions and Answers

Question 36:

• JAMB 2004

Aluminium hydroxide is used in the dyeing industry as a

A. Salt
B. Dye
C. Mordant
D. Dispersant

Question 37:

• JAMB 2004

Alloys are best prepared by

A. Electroplating
B. Arc-welding
C. Reducing and mixture of their metallic oxide
D. Cooling a molten mixture of the metals

Question 38:

• JAMB 2004

Transition metals possess variable oxidation states because they have

A. Electrons in the d orbitals
B. Electron in the s orbitals
C. A variable number of electrons in the p orbitals
D. Partially filled p orbitals

Question 39:

• JAMB 2004

Sodium metal is always kept under oil because it

A. Readily reacts with water
B. Is reduced by atmospheric nitrogen
C. Reacts vigorously on exposure to air
D. Reacts with oxygen and carbon (IV) oxide

Question 40:

• JAMB 2004

Oxyacetylene flame is used for iron-welding because it

A. Makes the iron metals solidify very quickly
B. Combines with oxygen to give a pop sound
C. Evolves a lot of heat when burnt
D. Dissociates to produce carbon (IV) oxide and oxygen