JAMB UTME - Chemistry - 1988 | Green Bridge CBT

Question 1 Rapport

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

evaporation

recrystallization

sublimation Bonne réponse

fractional precipitation

Détails de la réponse

Lisez la note de cours sur Kinetic Theory Of Matter And Gas Laws (JAMB)

Kinetic Theory Of Matter And Gas Laws

Voir la réponse

Question 2 Rapport

Alkanoates are formed by the reaction of alkanoic acid with?

Alkyl halides

alkanols Bonne réponse

ethers

sodium

Détails de la réponse

Lisez la note de cours sur Acids, Bases And Salts (JAMB)

Acids, Bases And Salts

Voir la réponse

Question 3 Rapport

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 Bonne réponse

Détails de la réponse

Lisez la note de cours sur Electrolysis (JAMB)

Electrolysis

Voir la réponse

Question 4 Rapport

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

lll

lV Bonne réponse

Détails de la réponse

Lisez la note de cours sur Energy Changes (JAMB)

Lisez la note de cours sur Energy And Energy Changes (WAEC)

Energy Changes

Energy And Energy Changes

Voir la réponse

Question 5 Rapport

Aluminium is extracted commercially from its ore by?

heating aluminium oxide with coke in a furance

the electrolysis of fused aluminium oxide in cryolite Bonne réponse

treating cryolite with sodium hydroxide solution under prressure

heating sodium aluminium silicate to a high temperature

Détails de la réponse

Lisez la note de cours sur Electrolysis (JAMB)

Electrolysis

Voir la réponse

Question 6 Rapport

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

Mg+

K+

CO22- Bonne réponse

HCO3

Détails de la réponse

Lisez la note de cours sur Kinetic Theory Of Matter And Gas Laws (JAMB)

Lisez la note de cours sur Acids, Bases And Salts (JAMB)

Kinetic Theory Of Matter And Gas Laws

Acids, Bases And Salts

Voir la réponse

Question 7 Rapport

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 Bonne réponse

there is no observable change

R and S react to generate heat

Détails de la réponse

Lisez la note de cours sur Separation Of Mixtures And Purification Of Chemical Substances (JAMB)

Separation Of Mixtures And Purification Of Chemical Substances

Voir la réponse

Question 8 Rapport

The IUPAC name for

2-methylbutanoic acid Bonne réponse

2-methyl-1- hydroxyketone

2-methyl-1-hydroxy aldehyde

2-methylpentanoic acid

Détails de la réponse

Lisez la note de cours sur Chemistry Of Carbon Compounds (Nigeria Only) (WAEC)

Chemistry Of Carbon Compounds (Nigeria Only)

Voir la réponse

Question 9 Rapport

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

Steam distillation

Destructive distillation Bonne réponse

Liquefaction

Hydrolysis

Détails de la réponse

Lisez la note de cours sur Chemical Combination (JAMB)

Chemical Combination

Voir la réponse

Question 10 Rapport

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 Bonne réponse

Détails de la réponse

Lisez la note de cours sur Energy Changes (JAMB)

Energy Changes

Voir la réponse

Question 11 Rapport

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 Bonne réponse

Détails de la réponse

Lisez la note de cours sur Atomic Structure And Bonding (JAMB)

Atomic Structure And Bonding

Voir la réponse

Question 12 Rapport

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

Cu2+ + 2e- → Cu(s) Bonne réponse

2Cl- -2e → Cl2

Cu(s) -2e → Cu2+(aq)

Cu2+(aq) + 2Cl-(aq) → CuCl2(aq)

Détails de la réponse

Lisez la note de cours sur Kinetic Theory Of Matter And Gas Laws (JAMB)

Lisez la note de cours sur Electrolysis (JAMB)

Kinetic Theory Of Matter And Gas Laws

Electrolysis

Voir la réponse

Question 13 Rapport

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 Bonne réponse

oxygen is heavier than nitrogen

nitrogen has a higher partial pressure in air

gases are hydrated in water

Détails de la réponse

Lisez la note de cours sur Water (JAMB)

Water

Voir la réponse

Question 14 Rapport

Which of the gas laws does the above graph illustrate?

Boyle

Charles Bonne réponse

Graham

Gay-Lussac

Détails de la réponse

Lisez la note de cours sur Kinetic Theory Of Matter And Gas Laws (JAMB)

Kinetic Theory Of Matter And Gas Laws

Voir la réponse

Question 15 Rapport

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 Bonne réponse

definite proportions

Détails de la réponse

Lisez la note de cours sur Stoichiometry And Chemical Reactions (WAEC)

Stoichiometry And Chemical Reactions

Voir la réponse

Question 16 Rapport

Detergents have the general formula?

R(CH2)nOH

RSO3-Na+ Bonne réponse

RSO-2Na+

RSO2H

Détails de la réponse

Lisez la note de cours sur Chemistry Of Carbon Compounds (Nigeria Only) (WAEC)

Chemistry Of Carbon Compounds (Nigeria Only)

Voir la réponse

Question 17 Rapport

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 Bonne réponse

K2Cr2O7 is oxidized

Détails de la réponse

Lisez la note de cours sur Acids, Bases And Salts (JAMB)

Acids, Bases And Salts

Voir la réponse

Question 18 Rapport

The four classes of hydrocarbons are?

ethane, ethene, ethyne and benzene

alkanes, alkenes, alkynes and aromatics Bonne réponse

alkanes, alkenes, alkynes and benzene

methane, ethane , propane and butane

Détails de la réponse

Lisez la note de cours sur Chemistry Of Carbon Compounds (Nigeria Only) (WAEC)

Lisez la note de cours sur Periodic Chemistry (Ghana Only) (WAEC)

Chemistry Of Carbon Compounds (Nigeria Only)

Periodic Chemistry (Ghana Only)

Voir la réponse

Question 19 Rapport

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

M3X4

M4X3 Bonne réponse

M3X2

Détails de la réponse

M2+ + X-4 = M4X3

Lisez la note de cours sur Chemical Combination (JAMB)

Chemical Combination

Voir la réponse

Question 20 Rapport

Suitable reagents for the laboratory preparation nitrogen are?

sodium dioxonitrate (III) and ammonium chloride Bonne réponse

sodium dioxonitrate (V) and ammonium chloride

sodium chloride and ammonium chloride

sodium chloride and ammonium diozonitrate (III)

Détails de la réponse

Lisez la note de cours sur Kinetic Theory Of Matter And Gas Laws (JAMB)

Kinetic Theory Of Matter And Gas Laws

Voir la réponse

Question 21 Rapport

Which of the following compounds has the highest boiling point?

CH3CH2CH2CH2HO Bonne réponse

CH3CH2CH2CHO

CH3CH2CH2CH3

CH3CH2OCH2CH3

Détails de la réponse

Lisez la note de cours sur Acids, Bases And Salts (JAMB)

Acids, Bases And Salts

Voir la réponse

Question 22 Rapport

Methylethanoate reacts with ammonia to yield?

mettylamine and ethanol

ethylamine and methanol

methanamide and ethanol

ethanamide and methanol Bonne réponse

Détails de la réponse

Lisez la note de cours sur Chemistry Of Carbon Compounds (Nigeria Only) (WAEC)

Chemistry Of Carbon Compounds (Nigeria Only)

Voir la réponse

Question 23 Rapport

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

Ionization potenial

Electron affinity

Electronegativity

Atomic radius Bonne réponse

Détails de la réponse

Lisez la note de cours sur Periodic Chemistry (Nigeria Only) (WAEC)

Periodic Chemistry (Nigeria Only)

Voir la réponse

Question 24 Rapport

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 Bonne réponse

density of the molecules

free mean path between each molecules and other

Détails de la réponse

Lisez la note de cours sur Kinetic Theory Of Matter And Gas Laws (JAMB)

Kinetic Theory Of Matter And Gas Laws

Voir la réponse

Question 25 Rapport

Which of the following is used in fire extinguishers?

Carbon (ll) oxide

Carbon (lV) oxide Bonne réponse

Sulphur (lV) oxide

Ammonia

Détails de la réponse

Lisez la note de cours sur Acids, Bases And Salts (JAMB)

Acids, Bases And Salts

Voir la réponse

Question 26 Rapport

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

evaporation

recrystallization

sublimation Bonne réponse

fractional precipitation

Détails de la réponse

Lisez la note de cours sur Separation Of Mixtures And Purification Of Chemical Substances (JAMB)

Separation Of Mixtures And Purification Of Chemical Substances

Voir la réponse

Question 27 Rapport

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

Heat content (enthalphy)

Energy of activation Bonne réponse

Free energy change

Equilibrium position

Détails de la réponse

Lisez la note de cours sur Kinetic Theory Of Matter And Gas Laws (JAMB)

Kinetic Theory Of Matter And Gas Laws

Voir la réponse

Question 28 Rapport

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

1 Bonne réponse

Détails de la réponse

Lisez la note de cours sur Chemistry Of Carbon Compounds (Nigeria Only) (WAEC)

Lisez la note de cours sur Structure Of The Atom (WAEC)

Chemistry Of Carbon Compounds (Nigeria Only)

Structure Of The Atom

Voir la réponse

Question 29 Rapport

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 Bonne réponse

56.0 dm3

44.8 dm3

Détails de la réponse

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

Lisez la note de cours sur Kinetic Theory Of Matter And Gas Laws (JAMB)

Kinetic Theory Of Matter And Gas Laws

Voir la réponse

Question 30 Rapport

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

NH4CI

NaCO3

FeCl3

NaCl Bonne réponse

Détails de la réponse

Lisez la note de cours sur Acids, Bases And Salts (Ghana Only) (WAEC)

Acids, Bases And Salts (Ghana Only)

Voir la réponse

Question 31 Rapport

Which of the following substances is a basic salt?

Na2CO3

Mg(OH)CI Bonne réponse

NaHCO3

KSO4.AI2(SO4)3,24H2O

Détails de la réponse

Lisez la note de cours sur Acids, Bases And Salts (Ghana Only) (WAEC)

Acids, Bases And Salts (Ghana Only)

Voir la réponse

Question 32 Rapport

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 Bonne réponse

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

Détails de la réponse

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.

Lisez la note de cours sur Kinetic Theory Of Matter And Gas Laws (JAMB)

Kinetic Theory Of Matter And Gas Laws

Voir la réponse

Question 33 Rapport

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 Bonne réponse

zinc

calcium

lead

Détails de la réponse

Lisez la note de cours sur Chemical Equilibria (JAMB)

Chemical Equilibria

Voir la réponse

Question 34 Rapport

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 Bonne réponse

acidified KMnO4 and water

water, acidified KMnO4 and oxygen

Détails de la réponse

Lisez la note de cours sur Environmental Pollution (JAMB)

Environmental Pollution

Voir la réponse

Question 35 Rapport

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

nitrogen (ll) oxide

nitrogen (l) oxide

nitrogen (lV) oxide Bonne réponse

nitrogen

Détails de la réponse

Lisez la note de cours sur Chemical Bonds (Nigeria Only) (WAEC)

Chemical Bonds (Nigeria Only)

Voir la réponse

Question 36 Rapport

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

-1 and 7 Bonne réponse

-1 and 6

-3 and 5

-2 and 6

Détails de la réponse

17 = 2, 8, 7

Voir la réponse

Question 37 Rapport

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 Bonne réponse

the crude copper is made the cathode of the cell

crude copper electrodes are used

Détails de la réponse

Lisez la note de cours sur Electrolysis (JAMB)

Electrolysis

Voir la réponse

Question 38 Rapport

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 Bonne réponse

Détails de la réponse

Lisez la note de cours sur Oxidation And Reduction (JAMB)

Oxidation And Reduction

Voir la réponse

Question 39 Rapport

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

first ionization energy

second ionization energy

electron affinity Bonne réponse

electronegativity

Détails de la réponse

Lisez la note de cours sur Atomic Structure And Bonding (JAMB)

Atomic Structure And Bonding

Voir la réponse

Question 40 Rapport

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

is heavier than air

is less dense than air

is insoluble in water Bonne réponse

burns in oxygen to form carbon (IV) oxide

Détails de la réponse

Lisez la note de cours sur Chemical Equilibria (JAMB)

Chemical Equilibria

Voir la réponse

Question 41 Rapport

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 Bonne réponse

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

Détails de la réponse

Lisez la note de cours sur Kinetic Theory Of Matter And Gas Laws (JAMB)

Kinetic Theory Of Matter And Gas Laws

Voir la réponse

Question 42 Rapport

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