Jamb Chemistry 1986 Past Questions and Answers

Question 6:

• JAMB 1986

Which of these represents a redox reaction?

A. AgNO₃ + NaCl → AgCAl + NaNO₃
B. H₂S + Pb(NO₃) → PbS + 2HNO₃
C. CaCO₃ → CaO + CO₂
D. Zn + 2HCl → ZnCl₂ + H₂

Question 7:

• JAMB 1986

20 cm³ of 1.0 molar NH₄OH solution when neutralized with 20.05cm³ of 0.1 molar HCl liberated -102 joules of heat. Calculate the heat of neutralization of NH₄OH?

A. -51.O KJ mol^-
B. +57.3 KJ mol^-
C. +57.O KJ mol^-
D. +51.0 KJ mol^-

Question 8:

• JAMB 1986

What is the consequences of increasing pressure on the equilibrium reaction ZnO_(s) + H_2(g) Zn_(s) + H₂O_(I)?

A. The equilibrium is driven to the left
B. The equilibrium is driven to the right
C. There is no effect
D. More ZnO is produced

Question 9:

• JAMB 1986

The approximate volume of air containing 10cm³ of oxygen is?

A. 20 cm³
B. 25 cm³
C. 50 cm³
D. 100 cm³

Question 10:

• JAMB 1986

The reaction Mg + H₂O → MgO + H₂ takes place only in the presence of?

A. Excess Mg ribbon
B. Excess cold water
C. Very hot water
D. Steam