Jamb Chemistry Past Questions and Answers

Question 1471:

• JAMB 2008

Insoluble salts can be prepared by

A. Titrating an alkali against an appropriate acid
B. Reacting an acid with trioxocarbonatr (IV) salt
C. Directing combination of the elements which make up the salt
D. Mixing two soluble compounds containing the metallic radical and the acidic radical

Question 1472:

• JAMB 2008

The oxidation state of carbon in HCOOH is

A. -1
B. +2
C. +3
D. Zero

Question 1473:

• JAMB 2008

What is the IUPAC nomenclature of the compound NaCIO?

A. Sodium oxochlorate (I)
B. Sodium chloro (I) oxide
C. Sodium monooxochlorate (II)
D. Sodium chloro (I) monoxide

Question 1474:

• JAMB 2008

In recharging a lead-acid accumulator, the reaction at the cathode can be represented as

A. Pb²⁺_(aq) + SO^2-_4(aq) →PbSO_4(s)
B. Pb²⁺_(aq) + 2e^- →Pb_(s)
C. Pb²⁺_(aq) + 2H₂O_(l) → PbO_2(s) + 4H⁺_(aq) + 4e^-
D. Pb_(s) → Pb²⁺_(aq) + 2e^-

Question 1475:

• JAMB 2008

If a given quantity of electricity liberates 0.65g of Zn²⁺, what amount of Hg²⁺ would be liberated by the same quantity of current?
[Zn = 65, Hg = 201]

A. 1.00g
B. 2.10g
C. 4.02g
D. 8.04g