Chemistry Past Questions and Answers

Question 4401 :

• JAMB 2022

Crude petroleum is converted to useful products by the process of?

A. Fractional crystallization
B. Fractional distillation
C. Filtration
D. Chromatography

Question 4402 :

• JAMB 2022

An organic compound contains 69% carbon, 15.3% hydrogen and 30.7% oxygen. Calculate the the empirical formula [C=12, H = 1, O = 16]

A. C\(_4\)H\(_12\)O
B. C\(_3\)H\(_9\)O
C. C\(_4\)H\(_9\)O
D. C\(_3\)H\(_8\)O

Question 4403 :

• JAMB 2022

2H\(_2\) + O\(_2\) → 2H\(_2\)O
From the equation above, calculate the volume of unreacted oxygen gas if a mixture of 50cm\(^3\) of hydroden and 75cm\(^3\) of oxygen are involved

A. 85cm\(^3\)
B. 50cm\(^3\)
C. 125cm\(^3\)
D. 55cm\(^3\)