JAMB UTME - Chemistry - 1988 | Green Bridge CBT

Pergunta 1 Relatório

Which of the following compounds has the highest boiling point?

CH3CH2CH2CH2HO Resposta correta

CH3CH2CH2CHO

CH3CH2CH2CH3

CH3CH2OCH2CH3

Detalhes da Resposta

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Pergunta 2 Relatório

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

is heavier than air

is less dense than air

is insoluble in water Resposta correta

burns in oxygen to form carbon (IV) oxide

Detalhes da Resposta

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Chemical Equilibria

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Pergunta 3 Relatório

The ion that may be assumed to have negligible concentration in a sample of water that lathers readily with soap is?

Mg+

K+

CO22- Resposta correta

HCO3

Detalhes da Resposta

Ler a nota de aula em Kinetic Theory Of Matter And Gas Laws (JAMB)

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Kinetic Theory Of Matter And Gas Laws

Acids, Bases And Salts

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Pergunta 4 Relatório

Which of the following substances is a basic salt?

Na2CO3

Mg(OH)CI Resposta correta

NaHCO3

KSO4.AI2(SO4)3,24H2O

Detalhes da Resposta

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Acids, Bases And Salts (Ghana Only)

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Pergunta 5 Relatório

Alkanoates are formed by the reaction of alkanoic acid with?

Alkyl halides

alkanols Resposta correta

ethers

sodium

Detalhes da Resposta

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Pergunta 6 Relatório

Given the reactions (i) Fe(s) + X(NO3)2(aq) → Fe(NO3) + X(s) (ii) H2(g) + XO → X + H2O(s); X is likely to be?

copper Resposta correta

zinc

calcium

lead

Detalhes da Resposta

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Chemical Equilibria

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Pergunta 7 Relatório

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 Resposta correta

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

Detalhes da Resposta

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.

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Pergunta 8 Relatório

Suitable reagents for the laboratory preparation nitrogen are?

sodium dioxonitrate (III) and ammonium chloride Resposta correta

sodium dioxonitrate (V) and ammonium chloride

sodium chloride and ammonium chloride

sodium chloride and ammonium diozonitrate (III)

Detalhes da Resposta

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Pergunta 9 Relatório

A substance S is isomorphous with another substance R. When a tiny crystals of S is added into a supersaturated solution of R?

S dissolves in the solution

crystals of R are precipitated Resposta correta

there is no observable change

R and S react to generate heat

Detalhes da Resposta

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Separation Of Mixtures And Purification Of Chemical Substances

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Pergunta 10 Relatório

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

M3X4

M4X3 Resposta correta

M3X2

Detalhes da Resposta

M2+ + X-4 = M4X3

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Chemical Combination

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Pergunta 11 Relatório

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

evaporation

recrystallization

sublimation Resposta correta

fractional precipitation

Detalhes da Resposta

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Kinetic Theory Of Matter And Gas Laws

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Pergunta 12 Relatório

Which property of a reversible reaction is affected by a catalyst?

Heat content (enthalphy)

Energy of activation Resposta correta

Free energy change

Equilibrium position

Detalhes da Resposta

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Kinetic Theory Of Matter And Gas Laws

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Pergunta 13 Relatório

The four classes of hydrocarbons are?

ethane, ethene, ethyne and benzene

alkanes, alkenes, alkynes and aromatics Resposta correta

alkanes, alkenes, alkynes and benzene

methane, ethane , propane and butane

Detalhes da Resposta

Ler a nota de aula em Chemistry Of Carbon Compounds (Nigeria Only) (WAEC)

Ler a nota de aula em Periodic Chemistry (Ghana Only) (WAEC)

Chemistry Of Carbon Compounds (Nigeria Only)

Periodic Chemistry (Ghana Only)

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Pergunta 14 Relatório

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 Resposta correta

K2Cr2O7 is oxidized

Detalhes da Resposta

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Pergunta 15 Relatório

Which of the gas laws does the above graph illustrate?

Boyle

Charles Resposta correta

Graham

Gay-Lussac

Detalhes da Resposta

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Pergunta 16 Relatório

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

1 Resposta correta

Detalhes da Resposta

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Chemistry Of Carbon Compounds (Nigeria Only)

Structure Of The Atom

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Pergunta 17 Relatório

Methylethanoate reacts with ammonia to yield?

mettylamine and ethanol

ethylamine and methanol

methanamide and ethanol

ethanamide and methanol Resposta correta

Detalhes da Resposta

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Chemistry Of Carbon Compounds (Nigeria Only)

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Pergunta 18 Relatório

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

Cu2+ + 2e- → Cu(s) Resposta correta

2Cl- -2e → Cl2

Cu(s) -2e → Cu2+(aq)

Cu2+(aq) + 2Cl-(aq) → CuCl2(aq)

Detalhes da Resposta

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Kinetic Theory Of Matter And Gas Laws

Electrolysis

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Pergunta 19 Relatório

The IUPAC name for

2-methylbutanoic acid Resposta correta

2-methyl-1- hydroxyketone

2-methyl-1-hydroxy aldehyde

2-methylpentanoic acid

Detalhes da Resposta

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Chemistry Of Carbon Compounds (Nigeria Only)

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Pergunta 20 Relatório

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

Steam distillation

Destructive distillation Resposta correta

Liquefaction

Hydrolysis

Detalhes da Resposta

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Chemical Combination

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Pergunta 21 Relatório

Which of the followingstatements is TRUE?

The dissolution of NaOH(s) in water is endothermic

The heat os solution of NaOH(s) is positive

The NaOH(s) gains heat from the surroundings

The heat of solution of NaOH(s) is negative Resposta correta

Detalhes da Resposta

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Energy Changes

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Pergunta 22 Relatório

When H2S gas is passed into a solution of iron (III) chloride, the colour changes from yellow to green. This is because?

H(s)S is reduced to S

Fe3+ ions are oxidized by H(s)S

Fe3+ ions are oxidized Fe3+ ions

Fe3+ ions are reduced to Fe2+ ions Resposta correta

Detalhes da Resposta

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Oxidation And Reduction

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Pergunta 23 Relatório

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 Resposta correta

56.0 dm3

44.8 dm3

Detalhes da Resposta

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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Pergunta 24 Relatório

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 Resposta correta

density of the molecules

free mean path between each molecules and other

Detalhes da Resposta

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Pergunta 25 Relatório

Chlorine is produced commercially by?

electrolysis of dilute hydrochloric acid

electrolysis of brine Resposta correta

neutralization of hydrogen chloride

heating potassium trioxochlorate (V)

Detalhes da Resposta

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Electrolysis

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Pergunta 26 Relatório

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 Resposta correta

definite proportions

Detalhes da Resposta

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Stoichiometry And Chemical Reactions

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Pergunta 27 Relatório

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 Resposta correta

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

Detalhes da Resposta

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Pergunta 28 Relatório

The diagram above shows the reaction path of an exothermic reaction. The heat of reaction is represented by

lll

lV Resposta correta

Detalhes da Resposta

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Energy Changes

Energy And Energy Changes

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Pergunta 29 Relatório

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

first ionization energy

second ionization energy

electron affinity Resposta correta

electronegativity

Detalhes da Resposta

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Atomic Structure And Bonding

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Pergunta 30 Relatório

Which of the following is used in fire extinguishers?

Carbon (ll) oxide

Carbon (lV) oxide Resposta correta

Sulphur (lV) oxide

Ammonia

Detalhes da Resposta

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Acids, Bases And Salts

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Pergunta 31 Relatório

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 Resposta correta

Detalhes da Resposta

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Stoichiometry And Chemical Reactions

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Pergunta 32 Relatório

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 Resposta correta

the crude copper is made the cathode of the cell

crude copper electrodes are used

Detalhes da Resposta

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Electrolysis

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Pergunta 33 Relatório

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 Resposta correta

oxygen is heavier than nitrogen

nitrogen has a higher partial pressure in air

gases are hydrated in water

Detalhes da Resposta

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Water

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Pergunta 34 Relatório

An eruption pollution an environment with gas suspected to be H2S, a poisonous gas. A residue team should spray the environment with?

water

moist SO2 Resposta correta

acidified KMnO4 and water

water, acidified KMnO4 and oxygen

Detalhes da Resposta

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Environmental Pollution

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Pergunta 35 Relatório

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

nitrogen (ll) oxide

nitrogen (l) oxide

nitrogen (lV) oxide Resposta correta

nitrogen

Detalhes da Resposta

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Chemical Bonds (Nigeria Only)

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Pergunta 36 Relatório

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

evaporation

recrystallization

sublimation Resposta correta

fractional precipitation

Detalhes da Resposta

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Separation Of Mixtures And Purification Of Chemical Substances

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Pergunta 37 Relatório

Detergents have the general formula?

R(CH2)nOH

RSO3-Na+ Resposta correta

RSO-2Na+

RSO2H

Detalhes da Resposta

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Chemistry Of Carbon Compounds (Nigeria Only)

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Pergunta 38 Relatório

Which of the following acts as both a reducing and an oxidizing agent?

SO2 Resposta correta

H2S

CO2

Detalhes da Resposta

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Oxidation And Reduction

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Pergunta 39 Relatório

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

NH4CI

NaCO3

FeCl3

NaCl Resposta correta

Detalhes da Resposta

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Acids, Bases And Salts (Ghana Only)

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Pergunta 40 Relatório

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

20 Resposta correta

Detalhes da Resposta

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Atomic Structure And Bonding

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Pergunta 41 Relatório

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 Resposta correta

Detalhes da Resposta

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Atomic Structure And Bonding

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Pergunta 42 Relatório

Which of the following physical properties decreases across the Periodic Table?

Ionization potenial

Electron affinity

Electronegativity

Atomic radius Resposta correta

Detalhes da Resposta

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Periodic Chemistry (Nigeria Only)

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Pergunta 43 Relatório

Aluminium is extracted commercially from its ore by?

heating aluminium oxide with coke in a furance

the electrolysis of fused aluminium oxide in cryolite Resposta correta

treating cryolite with sodium hydroxide solution under prressure

heating sodium aluminium silicate to a high temperature

Detalhes da Resposta

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Electrolysis

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Pergunta 44 Relatório

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

-1 and 7 Resposta correta

-1 and 6

-3 and 5

-2 and 6

Detalhes da Resposta

17 = 2, 8, 7

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Pergunta 45 Relatório

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 Resposta correta

Detalhes da Resposta

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Electrolysis

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