Jamb Chemistry Past Questions and Answers

Question 1781:

• JAMB 2014

CH₃COOC₂H₅(1) + H₂O₍₁₎ ⇌ CH ₃COOH _(aq) + C ₂H ₅OH _(aq)
The purpose of H⁺ in the reaction above is to

A. Increase the yield of products
B. Maintain the solution at a constant PH
C. Increase the rate of the hydrolysis
D. Decrease the rate of the reverse reaction

Question 1782:

• JAMB 2014

A hydrocarbon has an empirical formula CH and a vapour density of 39. Determine its molecular formula.
[C = 12, H = 1]

A. C₂H₆
B. C₃H₈
C. C₃H₄
D. C₆H₆

Question 1783:

• JAMB 2014

Polystyrene is widely used as packaging materials for fragile objects during transportation because of its

A. Ligjtness
B. Low density
C. High density
D. High compressibility

Question 1784:

• JAMB 2014

The process of converting linear alkanes to branched chain and cyclic hydrocarbons by heating in the presence of a catalyst to improve the quality of petrol is referred to as

A. Refining
B. Craching
C. Reforming
D. Blending

Question 1785:

• JAMB 2014

The petroleum fraction that is used in heating furnaces in industries is

A. Diesel oil
B. Gasoline
C. Kerosene
D. Lubricating oil