Jamb Chemistry Past Questions and Answers

Question 451:

• JAMB 1986

Which of the following solutions will conduct the least amount of electricity?

A. 2.00 M aqueous solution of NaOH
B. 0.01 M aqueous solution of NaOH
C. 0.01 M aqueous solution of hexanoic acid
D. 0.01 M aqueous solution of sugar

Question 452:

• JAMB 1986

How many coulombs of electricity are passed through a solution in which 6.5 amperes are allowed to run for 1.0 hour?

A. 3.90 x 10² coulombs
B. 5.50 x 10³ coulombs
C. 6.54 x 10³ coulombs
D. 2.34 x 10⁴ coulombs

Question 453:

• 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 454:

• 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 455:

• 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