JAMB UTME - Chemistry - 1988 | Green Bridge CBT

2.25g of a sample of an oxide of copper on reduction gave 2.0g of copper. 2.50g of another oxide of copper on reduction also gave 2.0g of copper. These results are in accordance with the law of?

constant composition

conservation of matter

multiple proportions Correct answer

definite proportions

Answer Details

Read lesson note on Stoichiometry And Chemical Reactions (WAEC)

Stoichiometry And Chemical Reactions

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Question 15 Report

What are the possible oxidation numbers of an element if its atomic number is 17?

-1 and 7 Correct answer

-1 and 6

-3 and 5

-2 and 6

Answer Details

17 = 2, 8, 7

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Question 16 Report

An increase in temperature causes an increase in the pressure of a gas because there is an increase in the?

average velocity of the molecules

number of collisions between the molecules Correct answer

density of the molecules

free mean path between each molecules and other

Answer Details

Read lesson note on Kinetic Theory Of Matter And Gas Laws (JAMB)

Kinetic Theory Of Matter And Gas Laws

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Question 17 Report

Which of the following in aqueous solution is neutral to litmus?

NH4CI

NaCO3

FeCl3

NaCl Correct answer

Answer Details

Read lesson note on Acids, Bases And Salts (Ghana Only) (WAEC)

Acids, Bases And Salts (Ghana Only)

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Question 18 Report

A metallic ion X2+ with an inert gas structure contains 18 electrons. How many protons are there in this ion?

20 Correct answer

Answer Details

Read lesson note on Atomic Structure And Bonding (JAMB)

Atomic Structure And Bonding

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Question 19 Report

Which of the following is used in fire extinguishers?

Carbon (ll) oxide

Carbon (lV) oxide Correct answer

Sulphur (lV) oxide

Ammonia

Answer Details

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Acids, Bases And Salts

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Question 20 Report

One mole of propane is mixed with five moles of oxygen. The mixture is ignited and the propane burns completely. What is the volume of the products at s.t.p?(G.M.V = 22.4 dm3 mol-1)

112.0 dm3

67.2 dm3 Correct answer

56.0 dm3

44.8 dm3

Answer Details

C3H8 + 5O2 → 3CO2 + 4H2O
When the mixture is ignited CO2 is collected as product. From the equation 33 moles of CO2 is produced which equals 3 x 2.4 dm3 = 67.2 dm3 at S.T.P

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Kinetic Theory Of Matter And Gas Laws

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Question 21 Report

The formula of a compound formed in a reaction between a trivalent metal M and a tetravalent non-metal X is~?

M3X4

M4X3 Correct answer

M3X2

Answer Details

M2+ + X-4 = M4X3

Read lesson note on Chemical Combination (JAMB)

Chemical Combination

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Question 22 Report

The energy changes accompanying the addition of an electron to a gaseous atom is called?

first ionization energy

second ionization energy

electron affinity Correct answer

electronegativity

Answer Details

Read lesson note on Atomic Structure And Bonding (JAMB)

Atomic Structure And Bonding

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Question 23 Report

Which of the following reactions takes place in the cathode compartment during the electrolysis of copper (II) chloride solution?

Cu2+ + 2e- → Cu(s) Correct answer

2Cl- -2e → Cl2

Cu(s) -2e → Cu2+(aq)

Cu2+(aq) + 2Cl-(aq) → CuCl2(aq)

Answer Details

Read lesson note on Kinetic Theory Of Matter And Gas Laws (JAMB)

Read lesson note on Electrolysis (JAMB)

Kinetic Theory Of Matter And Gas Laws

Electrolysis

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Question 24 Report

The thermal decomposition of copper (ll)trioxonitrate (V) yields copper (ll) oxide, oxygen and?

nitrogen (ll) oxide

nitrogen (l) oxide

nitrogen (lV) oxide Correct answer

nitrogen

Answer Details

Read lesson note on Chemical Bonds (Nigeria Only) (WAEC)

Chemical Bonds (Nigeria Only)

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Question 25 Report

The acidic hydrogen in the compound is the hydrogen attached to carbon number

1 Correct answer

Answer Details

Read lesson note on Chemistry Of Carbon Compounds (Nigeria Only) (WAEC)

Read lesson note on Structure Of The Atom (WAEC)

Chemistry Of Carbon Compounds (Nigeria Only)

Structure Of The Atom

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Question 26 Report

What volume of a 0.1 M H3PO4 will be required to neutralize 45.0 cm3 of a 0.2 M NaOH?

10.0 cm3

20.0 cm3

27.0 cm3

30.0 cm3 Correct answer

Answer Details

Read lesson note on Stoichiometry And Chemical Reactions (WAEC)

Stoichiometry And Chemical Reactions

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Question 27 Report

Methylethanoate reacts with ammonia to yield?

mettylamine and ethanol

ethylamine and methanol

methanamide and ethanol

ethanamide and methanol Correct answer

Answer Details

Read lesson note on Chemistry Of Carbon Compounds (Nigeria Only) (WAEC)

Chemistry Of Carbon Compounds (Nigeria Only)

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Question 28 Report

Which of the following compounds has the highest boiling point?

CH3CH2CH2CH2HO Correct answer

CH3CH2CH2CHO

CH3CH2CH2CH3

CH3CH2OCH2CH3

Answer Details

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Acids, Bases And Salts

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Question 29 Report

In the experiment above, ammonium chloride crystals deposit on the walls of the tube is as a result of

evaporation

recrystallization

sublimation Correct answer

fractional precipitation

Answer Details

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Kinetic Theory Of Matter And Gas Laws

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Question 30 Report

What process would coal undergo to give coal gas, coal tar, ammoniacal liquor and coke?

Steam distillation

Destructive distillation Correct answer

Liquefaction

Hydrolysis

Answer Details

Read lesson note on Chemical Combination (JAMB)

Chemical Combination

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Question 31 Report

A mixture of starch solution and potassium iodide was placed in a test tube. On adding dilute tetraoxosulphate (lV) acid and then K2Cr2O7 solutions, a blue-black colour was produced. In this reaction, the?

iodide is oxidized

tetraoxosulphate (Vl) acid acts as an oxidizing agent

starch has been oxidized Correct answer

K2Cr2O7 is oxidized

Answer Details

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Acids, Bases And Salts

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Question 32 Report

The molar ratio of oxygen to nitrogen in dissolved air is 2:1 whereas the ratio is 4:1 in atmospheric air because?

nitrogen is less soluble than oxygen Correct answer

oxygen is heavier than nitrogen

nitrogen has a higher partial pressure in air

gases are hydrated in water

Answer Details

Read lesson note on Water (JAMB)

Water

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Question 33 Report

Which of the following will produce the greatest increase in the rate of the chemical reaction represented by the equation Na2S2O3(aq) + 2HCl(aq) → 2NaCI(aq) + H2O(I) + SO2(g) + S(g)?

A decrease in temperature and an increase in the concentration of the reactants

An increase in the temperature and a decrease in the cocentration of the reactants

An increase in temperature and an increase in the concentration of the reactants Correct answer

A decrease in the temperature and a decrease in the concentration of the reactants

Answer Details

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Kinetic Theory Of Matter And Gas Laws

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Question 34 Report

In the experiment above, ammonium chloride crystals deposit on the walls of the tube is as a result of

evaporation

recrystallization

sublimation Correct answer

fractional precipitation

Answer Details

Read lesson note on Separation Of Mixtures And Purification Of Chemical Substances (JAMB)

Separation Of Mixtures And Purification Of Chemical Substances

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Question 35 Report

Crude copper can be purified by the electrolysis of CuSO4(aq) if?

platinum electrodes are used

the crude copper is made the anode of the cell Correct answer

the crude copper is made the cathode of the cell

crude copper electrodes are used

Answer Details

Read lesson note on Electrolysis (JAMB)

Electrolysis

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Question 36 Report

Which of the following substances is a basic salt?

Na2CO3

Mg(OH)CI Correct answer

NaHCO3

KSO4.AI2(SO4)3,24H2O

Answer Details

Read lesson note on Acids, Bases And Salts (Ghana Only) (WAEC)

Acids, Bases And Salts (Ghana Only)

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Question 37 Report

Carbon (ll) oxide may be collected as shown above because it

is heavier than air

is less dense than air

is insoluble in water Correct answer

burns in oxygen to form carbon (IV) oxide

Answer Details

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Chemical Equilibria

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Question 38 Report

Aluminium is extracted commercially from its ore by?

heating aluminium oxide with coke in a furance

the electrolysis of fused aluminium oxide in cryolite Correct answer

treating cryolite with sodium hydroxide solution under prressure

heating sodium aluminium silicate to a high temperature

Answer Details

Read lesson note on Electrolysis (JAMB)

Electrolysis

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Question 39 Report

The forces holding naphthalene crystals together can be overcome when naphthalene is heated to a temperature of 354K resulting in the crystal to melting. These forces are known as?

coulombic

ionic

covalent

Van der waals Correct answer

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Read lesson note on Atomic Structure And Bonding (JAMB)

Atomic Structure And Bonding

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Question 40 Report

Suitable reagents for the laboratory preparation nitrogen are?

sodium dioxonitrate (III) and ammonium chloride Correct answer

sodium dioxonitrate (V) and ammonium chloride

sodium chloride and ammonium chloride

sodium chloride and ammonium diozonitrate (III)

Answer Details

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Kinetic Theory Of Matter And Gas Laws

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Question 41 Report

Use the graph above to answer this question. The mass of a substance, M, liberated at an electrode during electrolysis is proportional to the quantity of electricity, Q passing through the electrolyte. This is represented graphically by.

A Correct answer

Answer Details

Read lesson note on Electrolysis (JAMB)

Electrolysis

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Question 42 Report

Which of the gas laws does the above graph illustrate?

Boyle

Charles Correct answer

Graham

Gay-Lussac

Answer Details

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Kinetic Theory Of Matter And Gas Laws

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Question 43 Report

Which of the following statements is NOT correct?

The average kinetic energy of a gas is directly proportional to its temperature

At constant tempearture, the volume of a gas increases as the pressure increases Correct answer

The pressure of a gas is inversely proportional to its volume

The temperature of a gas is directly proportional to its volume

The collisions of molecules with each other are inelastic

Answer Details

Increasing the pressure confines the gas molecules to a smaller space, thereby reducing the volume. Reducing the pressure the other way round increases the volume of a gas.

Read lesson note on Kinetic Theory Of Matter And Gas Laws (JAMB)

Kinetic Theory Of Matter And Gas Laws

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Question 44 Report

Chlorine is produced commercially by?

electrolysis of dilute hydrochloric acid

electrolysis of brine Correct answer

neutralization of hydrogen chloride

heating potassium trioxochlorate (V)

Answer Details

Read lesson note on Electrolysis (JAMB)

Electrolysis