+ ↔ + In the reaction above , is
- A.conjugate base
- B.acid
- C.base
- D.conjugate acid
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Answer: A. conjugate base
is the species formed after the acid loses a proton, making it the conjugate base of ethanoic acid.
JAMB Chemistry Past Questions 2011
10 questions from the JAMB 2011 Chemistry paper, with answers and explanations. Tap "Show answer" under each one when you are ready.
The molecular lattice of iodine is held together by
- A.dative bond
- B.metallic bond
- C.hydrogen bond
- D.van der Waal's forces
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Answer: D. van der Waal's forces
Iodine is a simple molecular solid; individual molecules are held together in the crystal lattice by weak van der Waal's forces.
Bronze is preferred to copper in the making of medals because it
- A.is stronger
- B.can withstand low temperature
- C.is lighter
- D.has low tensile strength
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Answer: A. is stronger
Bronze (copper-tin alloy) is harder and stronger than pure copper, making it more suitable and durable for medals.
The property of concentrated that makes it suitable for preparing is its
- A.boiling point
- B.density
- C.oxidizing properties
- D.dehydrating properties
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Answer: A. boiling point
Concentrated has a much higher boiling point than , so gentle heating with a nitrate salt allows the more volatile to distil off while remains.
The importance of sodium aluminate (III) in the treatment of water is to
- A.cause coagulation
- B.neutralize acidity
- C.prevent goitre and tooth decay
- D.kill germs
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Answer: B. neutralize acidity
Sodium aluminate is used in water treatment to help coagulate suspended particles for easier removal.
. What major factor influences the rate of this reaction?
- A.catalyst
- B.temperature
- C.concentration
- D.light
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Answer: D. light
This gas-phase substitution reaction between methane and chlorine is initiated and propagated by UV light (photochemical reaction).
At and zymase as catalyst, + energy. The reaction represented by the equation above is useful in the production of
- A.propanol
- B.butanol
- C.methanol
- D.ethanol
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Answer: D. ethanol
Zymase (yeast enzyme) ferments glucose into ethanol and carbon(IV) oxide; this is the basis of alcoholic fermentation for producing ethanol.
with conc as catalyst + → +
- A.esterification
- B.Condensation
- C.saponification
- D.neutralization
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Answer: A. esterification
The reaction of a carboxylic acid with an alcohol (with conc. catalyst) to form an ester and water is esterification.
The arrangement of particles in crystal lattices can be studied using
- A.X - rays
- B.γ - rays
- C.α - rays
- D.β - rays
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Answer: A. X - rays
X-rays, with wavelengths comparable to interatomic spacing, are used to study the arrangement of particles in crystal lattices (X-ray diffraction).
A chemical reaction which the hydration energy is greater than the lattice energy is referred to as
- A.a spontaneous reaction
- B.an endothermic reaction
- C.an exothermic reaction
- D.a reversible reaction
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Answer: B. an endothermic reaction
When the energy released on hydration of ions exceeds the lattice energy holding the solid together, the dissolution process is exothermic.
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