Chemistry 2016 JAMB Past Questions

1.In an electrochemical cell, polarization is caused by

A. Oxygen
B. Hydrogen
C. Tetraoxosulphate(IV) acid
D. Chlorine

Correct Answer: Option B

2. The condition required for corrosion to take place is the presence of

A. Oxygen and Carbon (IV) oxide
B. Water and Oxygen
C. Water and Carbon (IV) oxide and Oxygen
D. Water and Carbon (IV) oxide

Correct Answer: Option B

3.The enzyme used in the hydrolysis of starch to dextrin and maltose is

A. Zymase
B. Sucrase
C. Amylase
D. Lactase

Correct Answer: Option C

4.In the laboratory preparation of chlorine from concentrated hydrochloric acid in the presence of potassuim tetraoxomanganate(VII) the produced is dried by passing it through

A. Concentrated tetraoxosulphate (VI) acid
B. Anhydrous calcium chloride
C. Calcium oxide
D. Sodium hydroxide

Correct Answer: Option A

5.The monomer of nylon is

A. Hydroxybenzene
B. Hexanedioic acid
C. Benzene -1,-4-dicarboxylic acid
D. Ethane-1,2-diol

Correct Answer: Option B

6. The principle of column chromatography is based on th ability of the constituents to

A. React with the solvent in the column
B. React with each other in the solvent in the column
C. Dissolve in each other in the column
D. Move at different speeds in the column

Correct Answer: Option D

7.Ammonium chloride can be separated from its mixture with common salt by

A. Distillation
B. Evaporation
C. Decantation
D. Sublimation

Correct Answer: Option D

8. The ability of carbon to form long chains is referred to as

A. Alkylation
B. Acylation
C. Carbonation
D. Catenation

Correct Answer: Option D

9.The industrial preparation of hydrogen gas from water gas is referred to as

A. Bosch process
B. Contact process
C. Haber process
D. Bayer Process

10.The relative atomic mass of a naturally occurring lithium consisting of 90%

\frac{7}{3}

Li and 10%

\frac{6}{3}

Li is

A. 6.2
B. 6.8
C. 7.1
D. 6.9

Correct Answer: Option D

Explanation

(

\frac{90}{100}

x 7) + (

\frac{10}{100}

x 6)

= 6.3 + 0.6 = 6.9

11.The colour of litmus in an alkaline medium is

A. Red
B. Yellow
C. Pink
D. Blue

Correct Answer: Option D

12. The compounds CH₃CH₂CHO and CH₃COCH₃ can be distinguished from each other using

A. Dilute ammonia
B. Benedict's solution
C. Tollen's reagent
D. Sodium hydroxide solution

Correct Answer: Option C

13.Which of the following statements is true about 2-methylpropane and butane

A. They have different number of carbon atoms
B. They are members of same homologous series
C. They have the same boiling points
D. They have the same chemical properties

Correct Answer: Option D

14.The process that requires the use of hardwater in its operation is

A. Tanning
B. Bottling
C. Laundry
D. Dyeing

Correct Answer: Option B

16. The radioisotope used in industrial radiography for the rapid checking of faults in welds and casting is

A. Phosphorus-32
B. Cobalt-60
C. Carbon-14
D. Iodine-131

Correct Answer: Option B

17. The compound produced when sodium peroxide is heated with excess sodium is

A. Na₂CO₃
B. Na₂O
C. NaNO₂
D. NaOH

Correct Answer: Option B

18. The pollutant that contributes to the depletion of the ozone layer is

A. CFCs
B. NO₂
C. SO₂
D. CO

Correct Answer: Option A

19. Which of the following properties is not peculiar to matter?

A. Kinetic energy of particles increases from solid to gas
B. Random motion of particles increases from gas to solid
C. Orderliness of particles increases from gas to liquid
D. Random motion of particles increases from liquid to gas

Correct Answer: Option B

20. Cast iron is used in making

A. Chains and agricultural implements
B. Iron sheets and retort stand
C. Nails and iron rods
D. Stoves and cookers

Correct Answer: Option D

21. Which of the following compounds is used as a gaseous fuel?

A. CH₃ -CH₂ -CHO₂ -COOH
B. CH₃ -C = CH
C. CH₃ -CH₂ -CH₂ -CH₃
D. CH₂ -CH₂ -CH₃

Correct Answer: Option C

22. The product formed when propanol is heated over a copper catalyst in the absence of oxygen are

A. CH₃CH₂CHO and H₂
B. CH₃CHO and CO₂
C. CH₃CH₂COOH and H₂
D. CH₃COOH and CO₂

Correct Answer: Option D

23. Alkanols have the general molecular formula

A. C₁H_2n-2
B. C₁H_2n-1CHO
C. C₁H_2n-2OH
D. C₂H_2n+1OH

Correct Answer: Option D

24. Which of the following is not an alkali?

A. Ca(OH)₂
B. NH₃
C. NaOH
D. Al(OH)₃

Correct Answer: Option B

Explanation

Both NH₃ and Al(OH)₃ are not alkali

25. Which of the following statements is correct about the periodic table?

A. Elements in the same group have the same number of electron shells
B. The non-metallic properties of the elements tend to decrease across each period
C. Elements in the same period have the same number of valence electrons
D. The valence electrons of the elements increase progressively across the period

Correct Answer: Option D

26. The metal whose ore can be concentrated by passing it through a magnetic separator is

A. Zn
B. Sn
C. Cn
D. Ca

Correct Answer: Option B

27. An example of an acidic oxide is

A. NO
B. CO
C. SO₂
D. CuO

Correct Answer: Option C

28. What volume of 0.5M H2SO4 will exactly neutralize 20cm3 of 0.1M NaOH Solution?

A. 2.0cm ³
B. 5.0cm ₃
C. 6.8cm ³
D. 8.3cm ³

Correct Answer: Option A

Explanation

The balanced equation is given as:

H_{2} S O_{4} + 2 N a O H \to N a_{2} S O_{4} + 2 H_{2} O

Molarity of

N a O H = 0.1 M

Volume of

N a O H = 20 c m^{3}

Molarity of

H_{2} S O_{4} = 0.5 M

mol NaOH =

0.1 \times 20 c m^{3} = 2 m o l N a O H

⇒

2 m o l N a O H \times \frac{1 m o l H_{2} S O_{4}}{2 m o l N a O H} = 1 m o l H_{2} S O_{4}

v o l u m e o f H_{2} S O_{4} = \frac{m o l e o f H_{2} S O_{4}}{m o l a r i t y o f H_{2} S O_{4}}

\frac{1 m o l e}{0.5 M} = 2 c m^{3} H_{2} S O_{4}

29. Diamond cannot be used

A. In making bicycle chains
B. As abrasives
C. In cutting glass and metals
D. As dies for drawing wires

Correct Answer: Option A

30.Ethanol is soluble in water due to the presence of a

A. Carbonyl group
B. Hydroxyl groupd
C. Phenyl group
D. Methyl group

Correct Answer: Option B

31. The number of electronic shells contained in an atom with electron configuration 1s²2s²2p⁶3s²3p⁶4s² is

A. 3
B. 2
C. 4
D. 5

Correct Answer: Option C

32. The drying agent suitable for drying ammonia is

A. Calcium Chloride
B. Calcium Oxide
C. Phosphorus(V) Oxide
D. Concentrated H₂SO₄

Correct Answer: Option B

33.The arrangement of particles in crystal lattices can be studied using

A. X-rays
B. $β$ -rays
C. $α$ -rays
D. $γ$ -rays

Correct Answer: Option A

34. In the extraction of iron, the waste gas from the furnace is a mixture of

A. PH₃ CO and CO₂
B. CO and C
C. N₂ , CO and CO₂
D. PH₃ and CO

Correct Answer: Option C

Explanation

the

N_{2}

from the hot air blast to burn the coke (48%), the

C O

(23%) and

C O_{2}

(21%) produced from the reduction of the iron ore

F e_{2} O_{3}

by carbon (the coke) are the major components of the waste from the extraction.

35. In a neutralization reaction involving HCI and NaOH using litmus as indicator, the colour at the end point is

A. Blue
B. Red
C. Orange
D. Purple

Correct Answer: Option D

Explanation

Neutral litmus paper is purple. the result of a neutralization reaction is salt and water and hence is neutral.

36. An example of a solid emulsion is

A. Butter
B. Hair cream
C. Milk
D. Cod-liver oil

Correct Answer: Option A

37. An isotope has an atomic number of 15 and a mass number of 31. The number of proton it contains is

A. 16
B. 15
C. 31
D. 46

Correct Answer: Option B

38. Calculate the volume in cm³ of oxygen evolved at s.t.p when a current of 5A is passed through acidified water for 193s?

[F = 96500 C mol¹. Molar volume of a gas at s.t.p = 22.4dm³]

A. 0.056dm³
B. 0.224dm³
C. 224.000dm³
D. 56.000dm³

Correct Answer: Option A

Explanation

Q = 193 x 5 = 965C
40H

\mapsto

2H₂O + O₂ + 4e
4 x 96500C = 22.4dm³
965C = x

x =

\frac{22.4 \times 965}{4 \times 96500}

= 0.056dm³

39. The gas that is used for the treatment of cancer is

A. Neon
B. Radon
C. Xenon
D. Argon

Correct Answer: Option B

40. A chemical reaction in which the hydration energy is greater than the lattice energy is referred to as

A. A reversible reaction
B. A spontenous reaction
C. An endothermic reaction
D. An exothermic reaction

Correct Answer: Option D

41.

MnO_4(aq) + Y 5Fe²⁺ _(aq)

\mapsto

Mn²⁺ _(aq) + 5Fe ²⁺ _(aq) + 4H₂O₍₁₎

In the equation above, Y is

A. 10H⁺ _(aq)
B. 5H⁺ _(aq)
C. 8H⁺ _(aq)
D. 4H⁺ _(aq)

Correct Answer: Option C

The compound above exhibits

A. Geometric isomerism
B. Positional isomerism
C. Structural isomerism
D. Optical isomerism

Correct Answer: Option D

n monosaccharide

\underset{Q}{\overset{P}{⇌}}

polysaccharide -n water.

In the process above, P and Q respectively represent

A. Condensation and hydrolysis
B. Fermentation and condensation
C. Polymerization and hydrolysis
D. Polymerization and condensation

Correct Answer: Option A

The functional groups present in the compound above are

A. Alkene and halo-group
B. Hydroxyl and chloro-group
C. Alkene and chloro-group
D. Hydroxyl and halo-group

Correct Answer: Option B

In the diagram above, X is the

A. Enthalphy
B. Activated complex
C. Activation energy
D. Enthalphy change

Correct Answer: Option D

The diagram represents

A. A spontaneous reaction
B. An exothermic reaction
C. A non-spontaneous
D. An endothermic reaction

Correct Answer: Option C

The curve depicts titration between

A. Strong acid and strong base
B. Strong acid and weak base
C. Weak acid and weak base
D. Weak acid and strong base

Correct Answer: Option C

From the diagram above, an ideal gas can be represented by

A. K
B. M
C. L
D. N

Correct Answer: Option D

49. CH_4(g) + CI_2(g)

\to

CH₂CI_(s) + HCI_g

The major factor that influences the rate of the reaction above is

A. Concentration
B. Catalyst
C. Temperature
D. Light

Correct Answer: Option D

50. N₂O_4(aq)

⇌

2NO_2(g)

△

H = +ve

In the reaction above, an increase in temperature will

A. Increase the reactant production
B. Increase the value of the equilibrium constant
C. Shift the equilibrium to the left
D. Decrease the value of the equilibrium constant

Correct Answer: Option B

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