JAMB UTME - Chemistry - 1987 | Green Bridge CBT

Ibeere 1 Ìròyìn

A stream of air was successively passed through three tubes X, Y and Z containing a concentrated aqueous solution of KOH, red hot copper powder and fused calcium chloride respectively. What was the composition of the gas emanating from tube Z?

CO2 ad ithe inert gases

N2, CO2 and the inert gases

N2 and the inert gases Ìdáhùn tó tọ́

water vapour, N2 and the inert gases

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Kinetic Theory Of Matter And Gas Laws (JAMB)

Kinetic Theory Of Matter And Gas Laws

Wo Idahun

Ibeere 2 Ìròyìn

In which of the following are the aqueous solutions of each of the substances correctly arranged in order to decreasing acidity?

Ethanoic acid, milk or magnesia, sodium chloride, hydrochloric acid and sodium hydroxide

Ethanoic acid, hydrochloric acid, milk of magnesia, sodium chloride and sodium chloride and sodium hydroxide

Hydrochloride acid, ethanol acid, sodium chloride, milk of magnesia and sodium hydroxide Ìdáhùn tó tọ́

Hydrochloride acid, sodium hydroxide sodium chloride, ethanol acid, and milk of magnesia

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Acids, Bases And Salts (JAMB)

Acids, Bases And Salts

Wo Idahun

Ibeere 3 Ìròyìn

When water drops are added to calcium carbide in a container and the gas is passed through a jet and lifted, the resultant flame is called an?

oxyethylene flame

oxyhydrocarbon flame

oxyacetylene flame Ìdáhùn tó tọ́

oxymethane flame

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Acids, Bases And Salts (Ghana Only) (WAEC)

Acids, Bases And Salts (Ghana Only)

Wo Idahun

Ibeere 4 Ìròyìn

Which of the following compounds will give a precipitate with an aqueous ammoniacal solution of copper (l) chloride?

CH3 = CHCH3

CH3 ≡ CCH3 Ìdáhùn tó tọ́

HC = C-CH2CH3

CH2 = CH-CH = CH2

Awọn alaye Idahun

HC = C-CH2CH3

Ka ìwé ẹ̀kọ́ nípa Periodic Chemistry (Ghana Only) (WAEC)

Periodic Chemistry (Ghana Only)

Wo Idahun

Ibeere 5 Ìròyìn

Magnesium ribbon was allowed to burn inside a given gas P leaving a white solid residue Q. Addition of water to Q liberated a gas which produced dense white fumes with a drop of hydrochloric acid. The gas P was?

nitrogen Ìdáhùn tó tọ́

chlorine

oxygen

sulphur (IV) oxide

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Chemical Combination (JAMB)

Chemical Combination

Wo Idahun

Ibeere 6 Ìròyìn

An element Z, contained 90% of 168Z and 10% of Z1818 its relative atomic mass is?

16.0

16.2 Ìdáhùn tó tọ́

17.0

17.8

Awọn alaye Idahun

Mass number of Z = 16 while that of Z is 18
90 x 16 = 14.4 10 x 18 = 1.8
100 1 100 1
it relative atomic mass = 14.4 + 1.8 = 162

Ka ìwé ẹ̀kọ́ nípa Atomic Structure And Bonding (JAMB)

Atomic Structure And Bonding

Wo Idahun

Ibeere 7 Ìròyìn

An isotope has an atomic number of 17 and a mass number of 36. Which of the following gives the correct number of neutrons and protons in an atom of the isotope?

Neutrons 53, Protons 17

Neutrons 17, Protons 36

Neutrons 19, Protons 17 Ìdáhùn tó tọ́

Neutrons 36, Protons 17

Awọn alaye Idahun

Mass number = number of protons + number of neutrons
36 = 17 + X; X = 36 -17 = 19
19 neutrons and 17 protons

Ka ìwé ẹ̀kọ́ nípa Atomic Structure And Bonding (JAMB)

Atomic Structure And Bonding

Wo Idahun

Ibeere 8 Ìròyìn

In the purification of town water supply, alum is used principally to?

kill bacteria

control the pH of water

improve the taste of the water

coagulate small pasrticles of mud Ìdáhùn tó tọ́

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Solubility (JAMB)

Solubility

Wo Idahun

Ibeere 9 Ìròyìn

Which of the following water samples will have the highest titre value when titrated for the Ca2+ ions using soap solution?

Permanently hard water after boiling Ìdáhùn tó tọ́

emporarily hard water after boiling

Rain water stored in a glass jar for two years

Permanent hard water passed through permuitit

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Water (JAMB)

Water

Wo Idahun

Ibeere 10 Ìròyìn

In which of the following pairs of element is allotropy exhibited by each element?

Phosphorus and hydrogen

Oxygen and chlorine

Sulphur and nitrogen

Oxygen and sulphur Ìdáhùn tó tọ́

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Atomic Structure And Bonding (JAMB)

Atomic Structure And Bonding

Wo Idahun

Ibeere 11 Ìròyìn

The solubility of Na3AsO4(H2O)12 is 38.9g per 100g H2O. What is the mass percentage of Na3AsO4 in the saturated solution?

(As = 75, Na = 23, O = 16, H = 1)

87.27%

38.9%

19.1% Ìdáhùn tó tọ́

13.7%

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Solubility Of Substances (Ghana Only) (WAEC)

Solubility Of Substances (Ghana Only)

Wo Idahun

Ibeere 12 Ìròyìn

Which of the following gases can best be used for demonstrating the fountain experiment?

I) Nitrogen (ii) Ammonia (iii) Nitrogen (I) oxide

(iv) Hydrogen chloride.

ii and iii

i and iii

ii and iv Ìdáhùn tó tọ́

ii only

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Kinetic Theory Of Matter And Gas Laws (JAMB)

Kinetic Theory Of Matter And Gas Laws

Wo Idahun

Ibeere 13 Ìròyìn

Oil spillage in ponds and creeks can be cleaned up by?

burning off the oil layer

spraying with detergent Ìdáhùn tó tọ́

dispersal with compressed air

spraying with hot water

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Environmental Pollution (JAMB)

Environmental Pollution

Wo Idahun

Ibeere 14 Ìròyìn

Synthetic rubber is made by polymerization of?

2 methyl buta - 1, 3 - diene Ìdáhùn tó tọ́

2 methyl buta - 1, 2 - diene

2 methyl but -1-ene

2 methyl but-2-ene

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Basic Biochemistry And Synthetic Polymers (WAEC)

Basic Biochemistry And Synthetic Polymers

Wo Idahun

Ibeere 15 Ìròyìn

Ethanol reacts with aqueous sodium mono-oxoio date (l) to give a bright yellow solid with a characteristic smell. The product is?

trichloromethane

triodomethane Ìdáhùn tó tọ́

iodoethane

ethanal

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Acids, Bases And Salts (JAMB)

Acids, Bases And Salts

Wo Idahun

Ibeere 16 Ìròyìn

Local black soap is made by boiling palm oil with liquid extract of ash. The function of the ash is to provide the?

acid

ester of allanoic acid

alkali Ìdáhùn tó tọ́

alkanol

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Acids, Bases And Salts (JAMB)

Acids, Bases And Salts

Wo Idahun

Ibeere 17 Ìròyìn

The greater the different in electronegativity between bonded atoms, the?

lower the polarity of the bond

higher the polarity of the bond

weaker the bond Ìdáhùn tó tọ́

higher the possibility of the substance formed being a molecul

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Chemical Bonds (Ghana Only) (WAEC)

Ka ìwé ẹ̀kọ́ nípa Atomic Structure And Bonding (JAMB)

Chemical Bonds (Ghana Only)

Atomic Structure And Bonding

Wo Idahun

Ibeere 18 Ìròyìn

Inspite of the electronic configuration, 1s22s22p2, carbon is tetraavalent because?

the electrons in both 2s and 2p orbitals have equal energy

the electrons in both 2s and 2p orbitals are equivalent

both the 2s and 2p orbitals hybridizes Ìdáhùn tó tọ́

the six orbitals hybridize to four

Awọn alaye Idahun

both the 2s and 2p orbitals hydrodizes

Ka ìwé ẹ̀kọ́ nípa Atomic Structure And Bonding (JAMB)

Atomic Structure And Bonding

Wo Idahun

Ibeere 19 Ìròyìn

If 24.83 cm3 of 0.15 M NaOH is titrated to its end point with 39.45 cm3 of HCl, what is the molarity of the HCl?

0.094 M Ìdáhùn tó tọ́

0.150 M

0.940 M

1.500 M

Awọn alaye Idahun

NaOH + HCl → NaCl + H2O moles ratio = 1/1
↔ (MaVa) / Mb x 39.45 = 0.094

Ka ìwé ẹ̀kọ́ nípa Acids, Bases And Salts (JAMB)

Acids, Bases And Salts

Wo Idahun

Ibeere 20 Ìròyìn

If d represents the density of a gas and K is a constant, the rate of gaseous diffusion r is related to d by the equation?

r = k/√d Ìdáhùn tó tọ́

r = kd

r =k/d

r = k √d

Awọn alaye Idahun

r = k /√d

Ka ìwé ẹ̀kọ́ nípa Kinetic Theory Of Matter And Gas Laws (JAMB)

Kinetic Theory Of Matter And Gas Laws

Wo Idahun

Ibeere 21 Ìròyìn

Use the option above to answer this question. The structure of benzoic acid is

D Ìdáhùn tó tọ́

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Chemistry Of Carbon Compounds (Nigeria Only) (WAEC)

Chemistry Of Carbon Compounds (Nigeria Only)

Wo Idahun

Ibeere 22 Ìròyìn

Alloys are best prepared by?

high temperature weilding of the metals

electrolysis using the major metallic component as cathode

reducing a mixture of the oxies of the elements

cooling a molten mixture of the necessary elements Ìdáhùn tó tọ́

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Metals And Their Compounds (JAMB)

Metals And Their Compounds

Wo Idahun

Ibeere 23 Ìròyìn

Which of the following elements will form oxide which will dissolve both in dilute HNO3 and NaOH solutions to form salts?

Al Ìdáhùn tó tọ́

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Non-metals And Their Compounds (JAMB)

Non-metals And Their Compounds

Wo Idahun

Ibeere 24 Ìròyìn

Use the option above to answer this question. Which is the correct set of results for tests conducted respectively on fresh lime juice and ethanol.

A Ìdáhùn tó tọ́

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Energy And Energy Changes (WAEC)

Energy And Energy Changes

Wo Idahun

Ibeere 25 Ìròyìn

The best treatment for a student who accidentally poured concentrated tetraoxosulphate (VI) acid on his skin in the laboratory is to wash the skin with?

cold water

sodium hydroxide solution Ìdáhùn tó tọ́

iodine solution

sodium trioxocarbonate (IV) solution

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Acids, Bases And Salts (Ghana Only) (WAEC)

Acids, Bases And Salts (Ghana Only)

Wo Idahun

Ibeere 26 Ìròyìn

Stainless steel is an alloy of?

Iron, carbon and silver

iron, carbon and lead

iron, carbon and chromium Ìdáhùn tó tọ́

iron and carbon only

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Oxidation And Reduction (JAMB)

Oxidation And Reduction

Wo Idahun

Ibeere 27 Ìròyìn

Temp (°C)	25	35	45
Time (seconds)	72	36	18

The times taken for iodine to be liberated in the reaction between sodium thiosulphate and hydrochloric acid at various temperature are as follows. These results suggest that

for a 10o rise in temperature, rate of reaction is double Ìdáhùn tó tọ́

for a 10 o rise in temperature, rate of reaction is halved

time taken for iodine to appear does not depend on temperature

for a 10 o rise in temperature rate of reaction is tripled

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Kinetic Theory Of Matter And Gas Laws (JAMB)

Kinetic Theory Of Matter And Gas Laws

Wo Idahun

Ibeere 28 Ìròyìn

Complete oxidation of propan -1- ol gives?

propanal

propan-2-al

propan-1-one

propanoic acid Ìdáhùn tó tọ́

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Chemistry Of Carbon Compounds (Nigeria Only) (WAEC)

Chemistry Of Carbon Compounds (Nigeria Only)

Wo Idahun

Ibeere 29 Ìròyìn

The most volatile fraction obtained from fractional distillation of crude petroleum contains?

butane , propane and kerosene

butane , propane and petrol

ethane, methane and benzene

methane, ethane and propane Ìdáhùn tó tọ́

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Separation Of Mixtures And Purification Of Chemical Substances (JAMB)

Separation Of Mixtures And Purification Of Chemical Substances

Wo Idahun

Ibeere 30 Ìròyìn

The reaction between sulphur (IV) oxide and oxygen is represented by the equilibrium reaction 2SO2(g) + O2(g) ↔ 2SO3(g), ∆H = -196 kJ. What factor would influence increased production of SO3(g)?

Addition of a suitable catalyst

Increase in the temperature of the reaction

Decrease in the temperature of the reaction Ìdáhùn tó tọ́

Decrease in the concentration of SO2(g)

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Kinetic Theory Of Matter And Gas Laws (JAMB)

Kinetic Theory Of Matter And Gas Laws

Wo Idahun

Ibeere 31 Ìròyìn

When sodium hydroxide is heated with ammonium tetraoxosulphate (IV), the gas given off may be collected by?

bubbling it through concentrated H2SO2

bubbling it through water and then passing it through calcium oxide