Jamb Chemistry Past Questions and Answers

Question 81:

• JAMB 1978

The IUPAC names of the compounds CH3COOH and CH2=CH2 are respectively;

A. Acetic acid and ethene
B. Methanoic acid and ethene
C. Methanoic acid and ethylene
D. Ethanol and ethene
E. Acetic acid and ethylene

Question 82:

• JAMB 1978

If 30cm³ of oxygen diffuses through a porous pot in 7 seconds, how long will it take 60cm³ of chlorine to diffuse through the same pot, if the vapour densities of oxygen and chlorine are 16 and 36 respectively?

A. 9.3 sec
B. 14 sec
C. 21 sec
D. 28 sec
E. 30.3 sec

Question 83:

• JAMB 1978

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 84:

• JAMB 1978

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

A. HCl
B. N₂
C. Cl₂
D. SO₂
E. NH₃

Question 85:

• JAMB 1978

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

A. CaCO_3(s) CaO_(s) + CO_2(g)
B. C_(s) + O_2(g) CO_2(g)
C. 3FeCO_(s) + 2OCO_2(g) FeO_4(s)
D. SiO_2(s) + CaO_(s) CaCO_3(s)
E. CO_2(g) + C_(s) 2CO_(g)