Question 601:

• JAMB 1989

Bleaching powder, CaOCI₂, H₂O, deteriorates on exposure to air because

A. It loses its water of crystallization
B. Atmospheric nitrogen displaces chlorine from it
C. Carbon (IV) oxide of the atmosphere displaceschlorine from it
D. Bleaching agents should be stored in solution

Question 602:

• JAMB 1989

The products of the thermal decomposition of ammonium trioxonitrate (V) are

A. NO ₂ and oxygen
B. NH₃ and oxygen
C. Nitrogen and water
D. N₂O and water

Question 603:

• JAMB 1989

The scale of a chemical balance is made of iron plate and coated with copper electrolytically because

A. Iron is less susceptible to corrosion than copper
B. Copper is twice as less susceptitible to corrosion as iron
C. Copper is less susceptible to corrosion than iron
D. Copper and iron are equally susceptible to corrosion

Question 604:

• JAMB 1989

A metal is extracted from its ore by the electrolysis of its molten chloride and it displaces lead from lead (ll) trioxonitrate (V) solution. The metal is

A. Copper
B. Aluminium
C. Zinc
D. Sodium

Question 605:

• JAMB 1989

A metal is extracted from its ore by the electrolysis of its molten chloride and it displaces lead from lead (ll) trioxonitrate (V) solution. The metal is

A. Copper
B. Aluminium
C. Zinc
D. Sodium