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JAMB Chemistry Past Questions 2010

10 questions from the JAMB 2010 Chemistry paper, with answers and explanations. Tap "Show answer" under each one when you are ready.

JAMB 2010Question 1 · Acids, Bases, and Salts
The acid that is used to remove rust is?
  1. A.boric
  2. B.hydrochloric
  3. C.trioxonitrate (V)
  4. D.tetraoxosulphate (VI)
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Answer: B. hydrochloric

Hydrochloric acid reacts with iron oxide (rust) to dissolve it, and is commonly used to remove rust.

JAMB 2010Question 2 · Atomic Structure and Chemical Bonding
The maximum number of electrons in the L shell of an atom is?
  1. A.2
  2. B.8
  3. C.18
  4. D.32
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Answer: B. 8

Maximum electrons in a shell = ; for the L shell (n=2), this is 2 = 8.

JAMB 2010Question 3 · Chemistry of Metals
Stainless steel is used for making?
  1. A.magnets
  2. B.tools
  3. C.coins and medals
  4. D.moving parts of clocks
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Answer: B. tools

Stainless steel's resistance to corrosion and ability to hold a sharp edge make it suitable for tools.

JAMB 2010Question 4 · Environmental and Industrial Chemistry
12D + 13T → 24He + 01n + energy The reaction above illustrates?
  1. A.alpha decay
  2. B.artificial transmutation
  3. C.nuclear fussion
  4. D.nuclear fission
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Answer: C. nuclear fussion

Combining light nuclei (deuterium and tritium) to form a heavier nucleus (helium) with release of energy is nuclear fusion.

JAMB 2010Question 5 · Environmental and Industrial Chemistry
A compound gives an orange-red color to non-luminous flame. This compound is likely to contain?
  1. A.Na +
  2. B.
  3. C.
  4. D.
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Answer: B.

Calcium ions () impart an orange-red (brick-red) colour to a non-luminous flame.

JAMB 2010Question 6 · Organic Chemistry
Benzene reacts with hydrogen in the presence of nickel catalyst at to give?
  1. A.xylene
  2. B.toluene
  3. C.cyclopentane
  4. D.cyclohexane
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Answer: D. cyclohexane

Benzene undergoes catalytic hydrogenation with nickel at about to form cyclohexane.

JAMB 2010Question 7 · Organic Chemistry
The haloalkanes used in dry-cleaning industries are?
  1. A.trichloromethane and tetrachloromethane
  2. B.chloroethene and dichloroethene
  3. C.trichloroethene and tetrachloroethene
  4. D.chloroethane and dichloroethene
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Answer: C. trichloroethene and tetrachloroethene

Trichloroethene and tetrachloroethene are chlorinated solvents widely used in the dry-cleaning industry.

JAMB 2010Question 8 · Periodicity and Inorganic Chemistry
The stability of the noble gases is due to the fact that they?
  1. A.have no electron in their outermost shells
  2. B.have duplet or octet electron configurations
  3. C.belong to group zero of the periodic table
  4. D.are volatile in nature
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Answer: B. have duplet or octet electron configurations

Noble gases are stable because they have complete duplet (He) or octet electron configurations in their outermost shell.

JAMB 2010Question 9 · Physical Chemistry
Substance employed as drying agents are usually?
  1. A.amphoteric
  2. B.hygroscopic
  3. C.efflorescent
  4. D.acidic
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Answer: B. hygroscopic

Drying (desiccating) agents are hygroscopic, meaning they readily absorb moisture from their surroundings.

JAMB 2010Question 10 · Physical Chemistry
In the preparation of oxygen by heating KClO in the presence of MnO, only moderate heat is needed because the catalyst acts by?
  1. A.lowering the pressure of the reaction
  2. B.increasing the surface area of the reactant
  3. C.increase the rate of the reaction
  4. D.lowering the energy barrier of the reaction
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Answer: D. lowering the energy barrier of the reaction

A catalyst provides an alternative reaction pathway with a lower activation energy (energy barrier), so less heat is needed to achieve a given rate.

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