Jamb Chemistry 2008 Past Questions and Answers

Question 31:

• JAMB 2008

The substance that is used in the steel industry for the removal of carbon, sulphur and phosphorus impurities from pig iron is

A. Oxygen
B. Chlorine
C. Nitrogen
D. Hydrogen

Question 32:

• JAMB 2008

Which of the following compounds of trioxonitrate (V) will decomposes to give dinitrogen (i) oxide and water when heated?

A. NaNO₃
B. Zn(NO₃)₂
C. Cu(NO₃)₂
D. NH₄NO₃

Question 33:

• JAMB 2008

When a solution of ammonium trioxocarbonate (IV) is added to a solution of an unknown salt, a white precipitate which is soluble in dilute hydrochloric acid but insoluble in ethanoic acid is formed. This indicates the presence of

A. Ca²⁺
B. Na⁺
C. Zn²⁺
D. K⁺

Question 34:

• JAMB 2008

Leads is used for making bullets and lead shots because of its

A. Resistance to corrosion
B. Low melting point
C. High density
D. Flexibility

Question 35:

• JAMB 2008

which of the following gives a precipitate when treated with NaOH solution?

A. AlCl₃
B. NH₄Cl
C. Na₂CO₃
D. CH₃COONa