Jamb Chemistry 2005 Past Questions and Answers

Question 6:

• JAMB 2005

In which of the following reactions can the oxidation number of the nitrogen be said to have increased?

A. 2NO_(g) + O_2(g) → 2NO_2(g)
B. NO_(g) + Cl_2(g) → NOCl_2(l)
C. FeSO_4(aq) + NO_(g) → Fe(NO)SO_4(s)
D. NO_(g) + Br_2(l) → NOBr_2(l)

Question 7:

• JAMB 2005

2H₂ + O₂2 → H₂+O ΔH = -571kJ
In the equation above, how much heat will be liberated if 12.0g of hydrogen is burnt in excess oxygen?

A. -1142 kJ
B. -571 kJ
C. +1142 kJ
D. -1713 kJ

Question 8:

• JAMB 2005

A concentrated solution containing H⁺, Cu²⁺, OH^- and Cl^- was electrolyzed using platinum electrodes.
The ion that will be discharged at the cathode is

A. Cu²⁺
B. Cl^-
C. H⁺
D. OH^-

Question 9:

• JAMB 2005

When sulphur (IV) oxide is passed into a solution of sodium hydroxide for a long time, it eventually produces a solution of

A. NaHSO₄
B. Na₂SO₃
C. NaHSO₃
D. Na₂SO₄

Question 10:

• JAMB 2005

What is the correct IUPAC name for NO\(_{2} ^{-}\)?

A. Dioxonitrate (IV) ion
B. Trioxonitrate (III) ion
C. Trioxonitrate (IV) ion
D. Dioxonitrate (III) ion