JAMB UTME - Chemistry - 1988 | Green Bridge CBT

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

Maelezo ya Majibu

Soma maelezo ya somo kwenye Atomic Structure And Bonding (JAMB)

Atomic Structure And Bonding

Tazama Jibu

Swali 6 Ripoti

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

evaporation

recrystallization

sublimation

fractional precipitation

Maelezo ya Majibu

Soma maelezo ya somo kwenye Kinetic Theory Of Matter And Gas Laws (JAMB)

Kinetic Theory Of Matter And Gas Laws

Tazama Jibu

Swali 7 Ripoti

The IUPAC name for

2-methylbutanoic acid

2-methyl-1- hydroxyketone

2-methyl-1-hydroxy aldehyde

2-methylpentanoic acid

Maelezo ya Majibu

Soma maelezo ya somo kwenye Chemistry Of Carbon Compounds (Nigeria Only) (WAEC)

Chemistry Of Carbon Compounds (Nigeria Only)

Tazama Jibu

Swali 8 Ripoti

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

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

Maelezo ya Majibu

Soma maelezo ya somo kwenye Kinetic Theory Of Matter And Gas Laws (JAMB)

Kinetic Theory Of Matter And Gas Laws

Tazama Jibu

Swali 9 Ripoti

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

is heavier than air

is less dense than air

is insoluble in water

burns in oxygen to form carbon (IV) oxide

Maelezo ya Majibu

Soma maelezo ya somo kwenye Chemical Equilibria (JAMB)

Chemical Equilibria

Tazama Jibu

Swali 10 Ripoti

Aluminium is extracted commercially from its ore by?

heating aluminium oxide with coke in a furance

the electrolysis of fused aluminium oxide in cryolite

treating cryolite with sodium hydroxide solution under prressure

heating sodium aluminium silicate to a high temperature

Maelezo ya Majibu

Soma maelezo ya somo kwenye Electrolysis (JAMB)

Electrolysis

Tazama Jibu

Swali 11 Ripoti

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

K2Cr2O7 is oxidized

Maelezo ya Majibu

Soma maelezo ya somo kwenye Acids, Bases And Salts (JAMB)

Acids, Bases And Salts

Tazama Jibu

Swali 12 Ripoti

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

zinc

calcium

lead

Maelezo ya Majibu

Soma maelezo ya somo kwenye Chemical Equilibria (JAMB)

Chemical Equilibria

Tazama Jibu

Swali 13 Ripoti

Which of the following compounds has the highest boiling point?

CH3CH2CH2CH2HO

CH3CH2CH2CHO

CH3CH2CH2CH3

CH3CH2OCH2CH3

Maelezo ya Majibu

Soma maelezo ya somo kwenye Acids, Bases And Salts (JAMB)

Acids, Bases And Salts

Tazama Jibu

Swali 14 Ripoti

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

Maelezo ya Majibu

Soma maelezo ya somo kwenye Atomic Structure And Bonding (JAMB)

Atomic Structure And Bonding

Tazama Jibu

Swali 15 Ripoti

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

Maelezo ya Majibu

Soma maelezo ya somo kwenye Chemistry Of Carbon Compounds (Nigeria Only) (WAEC)

Soma maelezo ya somo kwenye Structure Of The Atom (WAEC)

Chemistry Of Carbon Compounds (Nigeria Only)

Structure Of The Atom

Tazama Jibu

Swali 16 Ripoti

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

SO2

H2S

CO2

Maelezo ya Majibu

Soma maelezo ya somo kwenye Oxidation And Reduction (JAMB)

Oxidation And Reduction

Tazama Jibu

Swali 17 Ripoti

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

NH4CI

NaCO3

FeCl3

NaCl

Maelezo ya Majibu

Soma maelezo ya somo kwenye Acids, Bases And Salts (Ghana Only) (WAEC)

Acids, Bases And Salts (Ghana Only)

Tazama Jibu

Swali 18 Ripoti

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

-1 and 7

-1 and 6

-3 and 5

-2 and 6

Maelezo ya Majibu

17 = 2, 8, 7

Tazama Jibu

Swali 19 Ripoti

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

there is no observable change

R and S react to generate heat

Maelezo ya Majibu

Soma maelezo ya somo kwenye Separation Of Mixtures And Purification Of Chemical Substances (JAMB)

Separation Of Mixtures And Purification Of Chemical Substances

Tazama Jibu

Swali 20 Ripoti

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

Maelezo ya Majibu

Soma maelezo ya somo kwenye Energy Changes (JAMB)

Energy Changes

Tazama Jibu

Swali 21 Ripoti

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

Maelezo ya Majibu

Soma maelezo ya somo kwenye Oxidation And Reduction (JAMB)

Oxidation And Reduction

Tazama Jibu

Swali 22 Ripoti

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

56.0 dm3

44.8 dm3

Maelezo ya Majibu

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

Soma maelezo ya somo kwenye Kinetic Theory Of Matter And Gas Laws (JAMB)

Kinetic Theory Of Matter And Gas Laws

Tazama Jibu

Swali 23 Ripoti

Which of the following substances is a basic salt?

Na2CO3

Mg(OH)CI

NaHCO3

KSO4.AI2(SO4)3,24H2O

Maelezo ya Majibu

Soma maelezo ya somo kwenye Acids, Bases And Salts (Ghana Only) (WAEC)

Acids, Bases And Salts (Ghana Only)

Tazama Jibu

Swali 24 Ripoti

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.

Maelezo ya Majibu

Soma maelezo ya somo kwenye Electrolysis (JAMB)

Electrolysis

Tazama Jibu

Swali 25 Ripoti

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

Heat content (enthalphy)

Energy of activation

Free energy change

Equilibrium position

Maelezo ya Majibu

Soma maelezo ya somo kwenye Kinetic Theory Of Matter And Gas Laws (JAMB)

Kinetic Theory Of Matter And Gas Laws

Tazama Jibu

Swali 26 Ripoti

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

M3X4

M4X3

M3X2

Maelezo ya Majibu

M2+ + X-4 = M4X3

Soma maelezo ya somo kwenye Chemical Combination (JAMB)

Chemical Combination

Tazama Jibu

Swali 27 Ripoti

Detergents have the general formula?

R(CH2)nOH

RSO3-Na+

RSO-2Na+

RSO2H

Maelezo ya Majibu

Soma maelezo ya somo kwenye Chemistry Of Carbon Compounds (Nigeria Only) (WAEC)

Chemistry Of Carbon Compounds (Nigeria Only)

Tazama Jibu

Swali 28 Ripoti

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

density of the molecules

free mean path between each molecules and other

Maelezo ya Majibu

Soma maelezo ya somo kwenye Kinetic Theory Of Matter And Gas Laws (JAMB)

Kinetic Theory Of Matter And Gas Laws

Tazama Jibu

Swali 29 Ripoti

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

acidified KMnO4 and water

water, acidified KMnO4 and oxygen

Maelezo ya Majibu

Soma maelezo ya somo kwenye Environmental Pollution (JAMB)

Environmental Pollution

Tazama Jibu

Swali 30 Ripoti

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

Mg+

K+

CO22-

HCO3

Maelezo ya Majibu

Soma maelezo ya somo kwenye Kinetic Theory Of Matter And Gas Laws (JAMB)

Soma maelezo ya somo kwenye Acids, Bases And Salts (JAMB)

Kinetic Theory Of Matter And Gas Laws

Acids, Bases And Salts

Tazama Jibu

Swali 31 Ripoti

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

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

Maelezo ya Majibu

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.

Soma maelezo ya somo kwenye Kinetic Theory Of Matter And Gas Laws (JAMB)

Kinetic Theory Of Matter And Gas Laws

Tazama Jibu

Swali 32 Ripoti

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

Ionization potenial

Electron affinity

Electronegativity

Atomic radius

Maelezo ya Majibu

Soma maelezo ya somo kwenye Periodic Chemistry (Nigeria Only) (WAEC)

Periodic Chemistry (Nigeria Only)

Tazama Jibu

Swali 33 Ripoti

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

first ionization energy

second ionization energy

electron affinity

electronegativity

Maelezo ya Majibu

Soma maelezo ya somo kwenye Atomic Structure And Bonding (JAMB)

Atomic Structure And Bonding

Tazama Jibu

Swali 34 Ripoti

Methylethanoate reacts with ammonia to yield?

mettylamine and ethanol

ethylamine and methanol

methanamide and ethanol

ethanamide and methanol

Maelezo ya Majibu

Soma maelezo ya somo kwenye Chemistry Of Carbon Compounds (Nigeria Only) (WAEC)

Chemistry Of Carbon Compounds (Nigeria Only)

Tazama Jibu

Swali 35 Ripoti

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

the crude copper is made the cathode of the cell

crude copper electrodes are used

Maelezo ya Majibu

Soma maelezo ya somo kwenye Electrolysis (JAMB)

Electrolysis

Tazama Jibu

Swali 36 Ripoti

Suitable reagents for the laboratory preparation nitrogen are?

sodium dioxonitrate (III) and ammonium chloride

sodium dioxonitrate (V) and ammonium chloride

sodium chloride and ammonium chloride

sodium chloride and ammonium diozonitrate (III)

Maelezo ya Majibu

Soma maelezo ya somo kwenye Kinetic Theory Of Matter And Gas Laws (JAMB)

Kinetic Theory Of Matter And Gas Laws

Tazama Jibu

Swali 37 Ripoti

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

lll

Maelezo ya Majibu

Soma maelezo ya somo kwenye Energy Changes (JAMB)

Soma maelezo ya somo kwenye Energy And Energy Changes (WAEC)

Energy Changes

Energy And Energy Changes

Tazama Jibu

Swali 38 Ripoti

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

definite proportions

Maelezo ya Majibu

Soma maelezo ya somo kwenye Stoichiometry And Chemical Reactions (WAEC)

Stoichiometry And Chemical Reactions

Tazama Jibu

Swali 39 Ripoti

Which of the following is used in fire extinguishers?

Carbon (ll) oxide

Carbon (lV) oxide