JAMB UTME - Chemistry - 1987

Ajụjụ 1 Ripọtì

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 Azịza ziri ezi

Neutrons 36, Protons 17

Akọwa Nkọwa

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

Gụọ akwụkwọ nkuzi na Atomic Structure And Bonding (JAMB)

Atomic Structure And Bonding

Lee Azịza

Ajụjụ 2 Ripọtì

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

passing it directly through calcium oxide Azịza ziri ezi

passing it directly through calcium chloride

Akọwa Nkọwa

Gụọ akwụkwọ nkuzi na Chemical Industry And Environment (WAEC)

Chemical Industry And Environment

Lee Azịza

Ajụjụ 3 Ripọtì

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 Azịza ziri ezi

water vapour, N2 and the inert gases

Akọwa Nkọwa

Gụọ akwụkwọ nkuzi na Kinetic Theory Of Matter And Gas Laws (JAMB)

Kinetic Theory Of Matter And Gas Laws

Lee Azịza

Ajụjụ 4 Ripọtì

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 Azịza ziri ezi

chlorine

oxygen

sulphur (IV) oxide

Akọwa Nkọwa

Gụọ akwụkwọ nkuzi na Chemical Combination (JAMB)

Chemical Combination

Lee Azịza

Ajụjụ 5 Ripọtì

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 Azịza ziri ezi

Akọwa Nkọwa

Gụọ akwụkwọ nkuzi na Solubility (JAMB)

Solubility

Lee Azịza

Ajụjụ 6 Ripọtì

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 Azịza ziri ezi

Decrease in the concentration of SO2(g)

Akọwa Nkọwa

Gụọ akwụkwọ nkuzi na Kinetic Theory Of Matter And Gas Laws (JAMB)

Kinetic Theory Of Matter And Gas Laws

Lee Azịza

Ajụjụ 7 Ripọtì

The atomic numbers of two elements X and Y are 12 and 19 respectively. The bond of these two elements is?

ionic

covalent Azịza ziri ezi

neutral

co-ordinate

Akọwa Nkọwa

Gụọ akwụkwọ nkuzi na Atomic Structure And Bonding (JAMB)

Atomic Structure And Bonding

Lee Azịza

Ajụjụ 8 Ripọtì

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 Azịza ziri ezi

Akọwa Nkọwa

Gụọ akwụkwọ nkuzi na Atomic Structure And Bonding (JAMB)

Atomic Structure And Bonding

Lee Azịza

Ajụjụ 9 Ripọtì

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 Azịza ziri ezi

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

Akọwa Nkọwa

Gụọ akwụkwọ nkuzi na Acids, Bases And Salts (JAMB)

Acids, Bases And Salts

Lee Azịza

Ajụjụ 10 Ripọtì

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 Azịza ziri ezi

r = kd

r =k/d

r = k √d

Akọwa Nkọwa

r = k /√d

Gụọ akwụkwọ nkuzi na Kinetic Theory Of Matter And Gas Laws (JAMB)

Kinetic Theory Of Matter And Gas Laws

Lee Azịza

Ajụjụ 11 Ripọtì

Stainless steel is an alloy of?

Iron, carbon and silver

iron, carbon and lead

iron, carbon and chromium Azịza ziri ezi

iron and carbon only

Akọwa Nkọwa

Gụọ akwụkwọ nkuzi na Oxidation And Reduction (JAMB)

Oxidation And Reduction

Lee Azịza

Ajụjụ 12 Ripọtì

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 Azịza ziri ezi

Akọwa Nkọwa

Gụọ akwụkwọ nkuzi na Metals And Their Compounds (JAMB)

Metals And Their Compounds

Lee Azịza

Ajụjụ 13 Ripọtì

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

Al Azịza ziri ezi

Akọwa Nkọwa

Gụọ akwụkwọ nkuzi na Non-metals And Their Compounds (JAMB)

Non-metals And Their Compounds

Lee Azịza

Ajụjụ 14 Ripọtì

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 Azịza ziri ezi

oxymethane flame

Akọwa Nkọwa

Gụọ akwụkwọ nkuzi na Acids, Bases And Salts (Ghana Only) (WAEC)

Acids, Bases And Salts (Ghana Only)

Lee Azịza

Ajụjụ 15 Ripọtì

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

burning off the oil layer

spraying with detergent Azịza ziri ezi

dispersal with compressed air

spraying with hot water

Akọwa Nkọwa

Gụọ akwụkwọ nkuzi na Environmental Pollution (JAMB)

Environmental Pollution

Lee Azịza

Ajụjụ 16 Ripọtì

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 Azịza ziri ezi

0.150 M

0.940 M

1.500 M

Akọwa Nkọwa

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

Gụọ akwụkwọ nkuzi na Acids, Bases And Salts (JAMB)

Acids, Bases And Salts

Lee Azịza

Ajụjụ 17 Ripọtì

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 Azịza ziri ezi

the six orbitals hybridize to four

Akọwa Nkọwa

both the 2s and 2p orbitals hydrodizes

Gụọ akwụkwọ nkuzi na Atomic Structure And Bonding (JAMB)

Atomic Structure And Bonding

Lee Azịza

Ajụjụ 18 Ripọtì

Corrosion is exhibited by

iron only

electropostive metals

metals below hydrogen inthe electrochemical series

all metals Azịza ziri ezi

Akọwa Nkọwa

Gụọ akwụkwọ nkuzi na Acids, Bases And Salts (JAMB)

Acids, Bases And Salts

Lee Azịza

Ajụjụ 19 Ripọtì

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 Azịza ziri ezi

Akọwa Nkọwa

Gụọ akwụkwọ nkuzi na Energy And Energy Changes (WAEC)

Energy And Energy Changes

Lee Azịza

Ajụjụ 20 Ripọtì

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 Azịza ziri ezi

higher the possibility of the substance formed being a molecul

Akọwa Nkọwa

Gụọ akwụkwọ nkuzi na Chemical Bonds (Ghana Only) (WAEC)

Gụọ akwụkwọ nkuzi na Atomic Structure And Bonding (JAMB)

Chemical Bonds (Ghana Only)

Atomic Structure And Bonding

Lee Azịza

Ajụjụ 21 Ripọtì

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 Azịza ziri ezi

emporarily hard water after boiling

Rain water stored in a glass jar for two years

Permanent hard water passed through permuitit

Akọwa Nkọwa

Gụọ akwụkwọ nkuzi na Water (JAMB)

Water

Lee Azịza

Ajụjụ 22 Ripọtì

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

16.0

16.2 Azịza ziri ezi

17.0

17.8

Akọwa Nkọwa

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

Gụọ akwụkwọ nkuzi na Atomic Structure And Bonding (JAMB)

Atomic Structure And Bonding

Lee Azịza

Ajụjụ 23 Ripọtì

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 Azịza ziri ezi

iodine solution

sodium trioxocarbonate (IV) solution

Akọwa Nkọwa

Gụọ akwụkwọ nkuzi na Acids, Bases And Salts (Ghana Only) (WAEC)

Acids, Bases And Salts (Ghana Only)

Lee Azịza

Ajụjụ 24 Ripọtì

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 Azịza ziri ezi

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

Akọwa Nkọwa

Gụọ akwụkwọ nkuzi na Kinetic Theory Of Matter And Gas Laws (JAMB)

Kinetic Theory Of Matter And Gas Laws

Lee Azịza

Ajụjụ 25 Ripọtì

Synthetic rubber is made by polymerization of?

2 methyl buta - 1, 3 - diene Azịza ziri ezi

2 methyl buta - 1, 2 - diene

2 methyl but -1-ene

2 methyl but-2-ene

Akọwa Nkọwa

Gụọ akwụkwọ nkuzi na Basic Biochemistry And Synthetic Polymers (WAEC)

Basic Biochemistry And Synthetic Polymers

Lee Azịza

Ajụjụ 26 Ripọtì

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 Azịza ziri ezi

ii only

Akọwa Nkọwa

Gụọ akwụkwọ nkuzi na Kinetic Theory Of Matter And Gas Laws (JAMB)

Kinetic Theory Of Matter And Gas Laws

Lee Azịza

Ajụjụ 27 Ripọtì

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

trichloromethane

triodomethane Azịza ziri ezi

iodoethane

ethanal

Akọwa Nkọwa

Gụọ akwụkwọ nkuzi na Acids, Bases And Salts (JAMB)

Acids, Bases And Salts

Lee Azịza

Ajụjụ 28 Ripọtì

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

D Azịza ziri ezi

Akọwa Nkọwa

Gụọ akwụkwọ nkuzi na Chemistry Of Carbon Compounds (Nigeria Only) (WAEC)

Chemistry Of Carbon Compounds (Nigeria Only)

Lee Azịza

Ajụjụ 29 Ripọtì

The efficiency of petrol as a fuel in high-compression internal combustion engines improves with an increase in the amount of?

branched chain alkanes Azịza ziri ezi

straight chain alkanes

cycloalkanes

halogenated hydrocarbons

Akọwa Nkọwa

Lee Azịza

Ajụjụ 30 Ripọtì

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 Azịza ziri ezi

alkanol

Akọwa Nkọwa

Gụọ akwụkwọ nkuzi na Acids, Bases And Salts (JAMB)

Acids, Bases And Salts

Lee Azịza

Ajụjụ 31 Ripọtì

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

CH3 = CHCH3

CH3 ≡ CCH3 Azịza ziri ezi

HC = C-CH2CH3

CH2 = CH-CH = CH2

Akọwa Nkọwa

HC = C-CH2CH3

Gụọ akwụkwọ nkuzi na Periodic Chemistry (Ghana Only) (WAEC)

Periodic Chemistry (Ghana Only)

Lee Azịza

Ajụjụ 32 Ripọtì

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% Azịza ziri ezi

13.7%

Akọwa Nkọwa

Gụọ akwụkwọ nkuzi na Solubility Of Substances (Ghana Only) (WAEC)

Solubility Of Substances (Ghana Only)

Lee Azịza

Ajụjụ 33 Ripọtì

Complete oxidation of propan -1- ol gives?

propanal

propan-2-al

propan-1-one

propanoic acid Azịza ziri ezi

Akọwa Nkọwa

Gụọ akwụkwọ nkuzi na Chemistry Of Carbon Compounds (Nigeria Only) (WAEC)

Chemistry Of Carbon Compounds (Nigeria Only)

Lee Azịza

Ajụjụ 34 Ripọtì

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 Azịza ziri ezi

Akọwa Nkọwa

Gụọ akwụkwọ nkuzi na Separation Of Mixtures And Purification Of Chemical Substances (JAMB)

Separation Of Mixtures And Purification Of Chemical Substances

Lee Azịza






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