Question 21:

• JAMB 2019

Brass and bronze are both metallic alloys. Which of the following constituents is common to both alloys?

A. Tin
B. Zinc
C. Copper
D. Lead
E. Aluminium

Question 22:

• JAMB 2019

Which of the following gases may not be dried with concentrated sulphuric acid?

A. HCl
B. N2
C. Cl2
D. SO2
E. NH3

Question 23:

• JAMB 2019

Which of the following reactions does not take place in the smelting of iron in a blast furnace?

A. CaCO3(s) CaO(s) + CO2(g)
B. C(s) + O2(g) CO2(g)
C. 3FeCO(s) + 2OCO2(g) FeO4(s)
D. SiO2(s) + CaO(s) CaCO3(s)
E. CO2(g) + C(s) 2CO(g)

Question 24:

• JAMB 2019

Which of the following is not a member of the homologous series of the paraffins (alkanes)?

A. C₃H₈
B. C₅H₁₂
C. C₇H₁₆
D. C₁₅H₃₂
E. C₂₄H₄₈

Question 25:

• JAMB 2019

When ammonia and hydrogen ion bond together to form ammonium ion, the bond formed is called

A. Ionic bond
B. Electrovalent bond
C. Covalent bond
D. Co-ordinate bond
E. Hydrogen bond