2022 - JAMB Chemistry Past Questions and Answers - page 3
Crude petroleum is converted to useful products by the process of?
fractional crystallization
fractional distillation
filtration
chromatography
An organic compound contains 69% carbon, 15.3% hydrogen and 30.7% oxygen. Calculate the the empirical formula [C=12, H = 1, O = 16]
C\(_4\)H\(_12\)O
C\(_3\)H\(_9\)O
C\(_4\)H\(_9\)O
C\(_3\)H\(_8\)O
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 hydrogen and 75cm\(^3\) of oxygen is involved
85cm\(^3\)
50cm\(^3\)
125cm\(^3\)
55cm\(^3\)
In which of the following will hydrogen form an ionic compound?
HCL
NaH
NH\(_3\)
CH\(_4\)
If the volume of a given mass of a gas at 0ºc is 29.5cm\(^3\). What will be the volume of the gas at 15ºc, given that the pressure remains constant?
31.6
62.2
32.7
31.1
The reactions below represent neutralization reactions, in which of them is the value of ΔH highest?
CH\(_3\)CH\(_2\)COOH + KOH → CH\(_3\)CH\(_2\)COOK + H\(_2\)O
NH\(_4\)OH + HCL → NH\(_4\) + H\(_2\)O
NaOH + HCL → NaCL + H\(_2\)O
CH\(_3\)COOH + NaOH → CH\(_3\)COONa + H\(_2\)O
The pollutant that is usually present in a city which generates its electricity from coal?
fog
carbon(ii)oxide
smog
sulphur(iv)oxide
The dehydration of CH\(_3\)CH\(_2\)CH\(_2\)CH\(_2\)OH will give?
HC≡CCH\(_2\)CH\(_3\)
CH\(_2\)≡CH\(_2\)CH\(_3\)
CH\(_3\)C≡CCH\(_3\)
CH\(_3\)CH=CHCH\(_3\)
When heat is absorbed during a chemical reaction, the reaction is said to be ___
thermodynamic
exothermic
isothermal
endothermic
Which of the following best represents a solid gas mixture?
milk
kerosene
soil
smoke