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JAMB Chemistry Past Questions 2016

10 questions from the JAMB 2016 Chemistry paper, with answers and explanations. Tap "Show answer" under each one when you are ready.

JAMB 2016Question 1 · Acids, Bases, and Salts
The colour of litmus in an alkaline medium is
  1. A.Red
  2. B.Yellow
  3. C.Pink
  4. D.Blue
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Answer: D. Blue

Litmus turns blue in an alkaline medium.

JAMB 2016Question 2 · Atomic Structure and Chemical Bonding
The relative atomic mass of a naturally occurring lithium consisting of 90%Li and 10%Li is
  1. A.6.2
  2. B.6.8
  3. C.7.1
  4. D.6.9
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Answer: D. 6.9

Average atomic mass = (0.90x7)+(0.10x6) = 6.3+0.6 = 6.9.

JAMB 2016Question 3 · Chemistry of Metals
Cast iron is used in making
  1. A.Chains and agricultural implements
  2. B.Iron sheets and retort stand
  3. C.Nails and iron rods
  4. D.Stoves and cookers
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Answer: D. Stoves and cookers

Cast iron's brittleness and good casting properties make it suitable for stoves and cookers.

JAMB 2016Question 4 · Chemistry of Non-metals and Gases
An example of an acidic oxide is
  1. A.NO
  2. B.CO
  3. C.
  4. D.CuO
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Answer: C.

Sulphur(IV) oxide is an acidic oxide, dissolving in water to form an acidic solution.

JAMB 2016Question 5 · Electrochemistry and Redox Reactions
Calculate the volume, in , of oxygen evolved at s.t.p. when a current of passes through acidified water for . [; molar gas volume at s.t.p. ]
  1. A.
  2. B.
  3. C.
  4. D.
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Answer: A.

Q = It = 5x193 = . Moles electrons = = . Since -4e- → +, moles = = . Volume = 0.0025x22.4 = .

JAMB 2016Question 6 · Environmental and Industrial Chemistry
The pollutant that contributes to the depletion of the ozone layer is
  1. A.CFCs
  2. B.
  3. C.
  4. D.CO
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Answer: A. CFCs

Chlorofluorocarbons (CFCs) are the main pollutants responsible for depleting the ozone layer.

JAMB 2016Question 7 · Organic Chemistry
The compounds and can be distinguished from each other using
  1. A.Dilute ammonia
  2. B.Benedict's solution
  3. C.Tollen's reagent
  4. D.Sodium hydroxide solution
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Answer: C. Tollen's reagent

Tollen's reagent gives a silver mirror with the aldehyde but not with the ketone , distinguishing them.

JAMB 2016Question 8 · Organic Chemistry
Alkanols have the general molecular formula
  1. A.C n n-2
  2. B.C n n+1 CHO
  3. C.C n n-2 OH
  4. D.C n n+1 OH
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Answer: D. C n n+1 OH

Alkanols (alcohols) have the general formula CnH2n+1OH.

JAMB 2016Question 9 · Physical Chemistry
The principle of column chromatography is based on th ability of the constituents to
  1. A.React with the solvent in the column
  2. B.React with each other in the solvent in the column
  3. C.Dissolve in each other in the column
  4. D.Move at different speeds in the column
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Answer: D. Move at different speeds in the column

Column chromatography separates mixture components based on their differing speeds of movement through the stationary phase.

JAMB 2016Question 10 · Physical Chemistry
A chemical reaction in which the hydration energy is greater than the lattice energy is referred to as
  1. A.A reversible reaction
  2. B.A spontenous reaction
  3. C.An endothermic reaction
  4. D.An exothermic reaction
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Answer: D. An exothermic reaction

When hydration energy exceeds lattice energy, net energy is released, making the dissolution process exothermic.

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