Jamb Chemistry 2008 Past Questions and Answers

Question 21:

• JAMB 2008

0.05 mol dm^-3 HCl is neutralized by 25 cm³ NaOH. If the volume of acid used is 32.00cm³, what is the concentration of the base

A. 0.016 mol dm^-3
B. 0.032 mol dm^-3
C. 0.039 mol dm^-3
D. 0.064 mol dm^-3

Question 22:

• 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 23:

• JAMB 2008

The oxidation state of carbon in HCOOH is

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

Question 24:

• 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 25:

• 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^-