Jamb Chemistry Past Questions For Year 1992

Question 21

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

jamb 1992

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

Question 22

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)

jamb 1992

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

Question 23

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

jamb 1992

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

Question 24

Which of the following equilibria shows little or no net reaction when the volume of the system is decreased?

jamb 1992

• A. H_2(g) + I_2(g) ≈ 2HI_(g)
• B. 2NO₂^(g) ≈ N₂O_4(g)O_4(g)N₂O_4(g)
• C. PCI_5(g) ≈ PCI_3(g) + CI_2(g)
• D. ZnO_(s) + CO_2(g) ≈ ZnCO_3(g)

Question 25

In what way is equilibrium constant for the forward reaction related to that of the reversed reaction?

jamb 1992

• A. The additional of the two is expected to be one
• B. The product of the two is expected to be one
• C. The two equilibrium constants are identical
• D. The product of the two is always greater than one