Question 741:

• JAMB 1992

A sample of orange juice is found to have a pH of 3.80. What is he concentration of the hydroxide ion in the juice?

A. 1.6 x 10^-4
B. 6.3 x 10^-11
C. 6.3 x 10^-4
D. 1.6 x 10^-11

Question 742:

• JAMB 1992

Arrange HCI, CH₃COOH, C₆H₅CH₃ in order of increasing conductivity.

A. HCI, CH₃COOH, C₆H₅CH₃
B. C₆H₅CH₃, HCI, CH₃COOH
C. C₆H₅CH₃, CH₃COOH, HCI
D. CH₃COOH, C₆H₅CH₃, HCI

Question 743:

• JAMB 1992

How many grams of H₂SO₄ are necessary for the preparation of 0.175 dm³ of M 6.00 M H₂SO₄?
(S = 32.06, O = 16.00 H = 1.00)

A. 206.0 g
B. 103.0 g
C. 98.1 g
D. 51.5 g

Question 744:

• JAMB 1992

Copper (II) tetraoxosulphate (VI) solution is electrolyzed using carbon electrodes. Which of the following are produced at the anode and cathode respectively ?

A. Copper and oxygen
B. Oxygen and copper
C. Hydrogen and copper
D. Copper and hydrogen

Question 745:

• JAMB 1992

Calculate the mass, in kilograms, of magnesium produced by the electrolysis of magnesium (II) chloride in a cell operating for 24 hours at 500 amperes.

A. 2.7
B. 5.4
C. 10.8
D. 21.7