Question 746:

• JAMB 1992

S₂O^2-₃ + I₂ → S₂O₆^2- + 2I^-. In reaction above, the oxidizing agent is?

A. S₂O₃^2-
B. I₂
C. S₄O₆^2-
D. I^-

Question 747:

• JAMB 1992

MnO₂ + 2CI^- + 4H⁺ → MnO²⁺ + CI₂ + 2H₂O.
The changes is oxidation numbers when the manganese, chloride and hydrogen ions react according to the above equation are respectively?

A. 2, 2, 4
B. -1, -2, 4
C. -2, 1, 0
D. 2, 4, 0

Question 748:

• JAMB 1992

In which of the following is the entropy change positive?

A. H₂O_(I) → H₂O_(g)
B. Cu²⁺_{(aq) + Fe[sub](s)} → Fe⁽²⁺⁾ + Cu_(s)[/sub]
C. N_2(g) + 3H_2(g) → 2NH_3(g)
D. 2HCI_(s) → H_2(g) + CI_2(g)

Question 749:

• JAMB 1992

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

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

Question 750:

• JAMB 1992

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

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)