Oxidation and reduction - Jamb Chemistry Past Questions and Answers

Question 86:

• JAMB 2012

The oxidation number of boron in NaBH ₄ is

A. -3
B. -1
C. +1
D. +3

Question 87:

• JAMB 2012

2Na ₂ O _2(s) + 2H ₂ O ₂₍₁₎ → 4 NaOH_(s) +O_2(s)
The substance that is oxidized in the reaction above is

A. 2NaO_2(s)
B. NaOH(aq)
C. H₂O₍₁₎
D. O_2(g)

Question 88:

• JAMB 2013

Sulphur (IV)oxide is a strong reducing agent in the presence of water due to the formation of

A. Hydroxide ion
B. Sulpgur (Vl)oxide
C. Hydrogen sulhide
D. Trioxosulphate (IV) salt

Question 89:

• JAMB 2013

A metal that forms soluble trioxosulphate (IV) ion is

A. Barium
B. Potassium
C. Manganese
D. Aluminium

Question 90:

• JAMB 2013

Zn_(s) + CuSO_4(aq) \( \to \) ZnSO_4(aq) + Cu_(s)
In the reaction above, the oxidizing agent is

A. CuSO_4(aq)
B. ZnSO_4(aq)
C. Cu_(s)
D. Zn_(s)