Jamb Chemistry 1986 Past Questions and Answers

Question 21:

• JAMB 1986

What are the values of x, y and z respectively in the equation: xCu + yHNO₃ → xCu(NO₃)₂ + 4H₂O + zNO?

A. 4: 1: 2
B. 3:8:2
C. 2:8:3
D. 8:3:2

Question 22:

• JAMB 1986

The iron (III) oxide impurity in bauxite can be removed by?

A. Fractional crystallization in acid solution
B. Dissolution in sodium hydroxide and filtration
C. Extraction with concentrated ammonia and reprecipitation
D. Electroysis of molten mixture

Question 23:

• JAMB 1986

Which of the following does NOT contain aluminium as component?

A. Over-head cables
B. Duralumin
C. Container for caustic soda
D. Container for nitric acid

Question 24:

• JAMB 1986

A white solid suspected to be lead trioxonitrate (V) zinc trioxocarbonate (IV) or calcium trioxocabonate (IV) was heated strongly. Its residue which was yellow when hot and white when cold is?

A. Lead (II) oxide
B. Calcium oxide
C. Zinc oxide
D. Lead nitrate

Question 25:

• JAMB 1986

Which of the following compounds would give lilac flame coloration and a white precipitate with acidified barium chloride solution?

A. KCI
B. NaNO₃
C. K₂SO₄
D. CaSO₄