Jamb Chemistry Past Questions and Answers

Question 381:

• JAMB 1984

Which of the following statements is INCORRECT?

A. Fractional distillation of crude petroleum will give the folloing hydrocarbon fuels in order of increasing boiling point
B. Butane < petrol < kerosene of polythene.
C. Both but-1-ene and but-1-yne will decolorize bromine readily
D. But-2-ene will react with chlorine to form 2,3-dichlorobutane
E. Calcuim carbide will react with water to form any alkyne

Question 382:

• JAMB 1984

Which of the following statements is NOT correct about all four of the acids: HBr, HNO₃, H ₂CO₃ and H₂SO₄? They

A. Dissolve marble to liberate CO
B. Have a PH less than 7
C. Turn blue litmus red
D. Neutralize alkalis to form salt
E. React with magnesium to liberate hydrogen

Question 383:

• JAMB 1984

If the cost of electricity required to deposit 1 g of magnesium is N5.00, how much would it cost to deposit 10g of aluminium?

A. N 10.00
B. N27.00
C. N44.44
D. N66.67
E. N33.33

Question 384:

• JAMB 1984

Nitrogen can best be obtained from a mixture over oxygen and nitrogen by passing the mixture over

A. Potassium hydroxide
B. Heated gold
C. Heated magnesium
D. Heated phosphorus
E. Calcium chloride

Question 385:

• JAMB 1984

Water is said to be 'hard' if it

A. Easily forms ice
B. Has to be warmed before sodium chloride dissolves in it
C. Froms an insoluble scum with soap
D. Contains nitrates
E. Contains sodium ions