Oxidation and reduction - Jamb Chemistry Past Questions and Answers

Question 46:

• JAMB 1993

NH₃ + H₃O⁺
→ NH₄⁺ + H₂O. It may be deduced from the reaction above that?

A. A redox reaction has occurred
B. H₃O⁺ acts as an oxidizing agent
C. H₃O⁺ acts as an acid
D. Water acts as ab acid

Question 47:

• JAMB 1993

The oxidation states of chlorine in HOCL, HCLO₃ and HCLO₄ are respectively?

A. -1, +5, and +7
B. -1, -5 and 7
C. +1, +3 and +4
D. +1, +5 and +7

Question 48:

• JAMB 1993

NaCI_(s) + H₂SO_4(I) → HCI_(g) + NaHSO_4(s).
In the reaction above, H₂SO₄ behaves as?

A. A strong acid
B. An oxidizing agent
C. A good solvent
D. A dehydrating agent

Question 49:

• JAMB 1993

Which of these salts will produce its metal, oxygen and nitrogen (IV) oxide on heating?

A. Silver and trioxonitrate (V)
B. Sodium trioxonitrate (V)
C. Calcium trioxonitrate (V)
D. Lithium trioxonitrate (V)

Question 50:

• JAMB 1993

The active reducing agent in the blast furnace for the extraction of iron is?

A. Carbon
B. Limestone
C. Carbon(II)oxide
D. Calcium oxide