The basicity of is
- A.4
- B.1
- C.2
- D.3
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Answer: B. 1
Ethanoic acid has only one ionizable hydrogen (from the -COOH group), giving it a basicity of 1.
JAMB Chemistry Past Questions 2014
10 questions from the JAMB 2014 Chemistry paper, with answers and explanations. Tap "Show answer" under each one when you are ready.
A mixture is different from a compound because
- A.the properties of a compound are those of its individual constituents while those of a mixture differ from its constituents
- B.a mixture is always homogeneous while a compound is not
- C.the constituent of a compound are chemically bound together while those of a mixture are not
- D.a mixture can be represented by a chemical formula while a compound cannot
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Answer: C. the constituent of a compound are chemically bound together while those of a mixture are not
In a compound, constituent elements are held together by chemical bonds in fixed proportions; in a mixture, constituents are simply combined physically and retain their individual properties.
A gas X diffuses twice as fast as gas Y. if the relative molecular mass of X is 32, calculate the relative molecular mass of Y.
- A.128
- B.8
- C.16
- D.64
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Answer: A. 128
By Graham's law, rate is inversely proportional to . RateX/RateY = ; 2 = , so My = 4x32 = 128.
The oxidizing agent in the reaction above is
- A.
- B.
- C.
- D.H (2) (g)
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Answer: C.
In the water-gas reaction, supplies which is reduced to (H goes from +1 to 0), making the oxidizing agent (carbon is oxidized to CO).
In the electrolytic extraction of calcium from calcium chloride, the cathode is
- A.zinc
- B.graphite
- C.platinum
- D.iron
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Answer: D. iron
In the electrolytic extraction of calcium from molten calcium chloride, iron is commonly used as the cathode.
The general formula of haloalkanes where X represents the halide is
- A.C n n-1 X.
- B.C n n X.
- C.C n n+2 X
- D.C n n+1 X
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Answer: D. C n n+1 X
The general formula for haloalkanes is CnH2n+1X.
The process of converting starch to ethanol is
- A.cracking
- B.distillation
- C.fermentation
- D.oxidation
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Answer: C. fermentation
Fermentation, using enzymes (e.g. from yeast), converts starch (via glucose) into ethanol.
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.cracking
- C.reforming
- D.blending
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Answer: C. reforming
Reforming converts straight-chain alkanes into branched-chain and cyclic/aromatic hydrocarbons using a catalyst, improving petrol's octane rating.
The radio active radiation used in studying the arrangement of particles in giant organic molecules is
- A.- rays
- B.- particles
- C.X-rays
- D. - particles
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Answer: C. X-rays
X-rays are used to study the arrangement of particles/atoms in giant molecules through X-ray diffraction/crystallography.
In an equilibrium reaction, which of the following conditions indicates that maximum yield of the product will be obtained?
- A.Equilibrium constant is very large
- B.∆H - T∆S = O
- C.∆ H > T ∆ S
- D.Equilibrium constant is less than zero
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Answer: A. Equilibrium constant is very large
A very large equilibrium constant indicates the equilibrium lies strongly towards products, giving maximum yield.
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