JAMB UTME - Chemistry - 1987 | Green Bridge CBT

Question 1 Rapport

Stainless steel is an alloy of?

Iron, carbon and silver

iron, carbon and lead

iron, carbon and chromium Bonne réponse

iron and carbon only

Détails de la réponse

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

Oxidation And Reduction

Voir la réponse

Question 2 Rapport

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 Bonne réponse

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

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

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 Bonne réponse

Decrease in the concentration of SO2(g)

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 4 Rapport

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 Bonne réponse

water vapour, N2 and the inert gases

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 5 Rapport

Synthetic rubber is made by polymerization of?

2 methyl buta - 1, 3 - diene Bonne réponse

2 methyl buta - 1, 2 - diene

2 methyl but -1-ene

2 methyl but-2-ene

Détails de la réponse

Lisez la note de cours sur Basic Biochemistry And Synthetic Polymers (WAEC)

Basic Biochemistry And Synthetic Polymers

Voir la réponse

Question 6 Rapport

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 Bonne réponse

Détails de la réponse

Lisez la note de cours sur Metals And Their Compounds (JAMB)

Metals And Their Compounds

Voir la réponse

Question 7 Rapport

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 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 8 Rapport

Corrosion is exhibited by

iron only

electropostive metals

metals below hydrogen inthe electrochemical series

all metals Bonne réponse

Détails de la réponse

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

Acids, Bases And Salts

Voir la réponse

Question 9 Rapport

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 Bonne réponse

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

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 10 Rapport

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

Al Bonne réponse

Détails de la réponse

Lisez la note de cours sur Non-metals And Their Compounds (JAMB)

Non-metals And Their Compounds

Voir la réponse

Question 11 Rapport

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 Bonne réponse

the six orbitals hybridize to four

Détails de la réponse

both the 2s and 2p orbitals hydrodizes

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

Atomic Structure And Bonding

Voir la réponse

Question 12 Rapport

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 Bonne réponse

Détails de la réponse

Lisez la note de cours sur Solubility (JAMB)

Solubility

Voir la réponse

Question 13 Rapport

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% Bonne réponse

13.7%

Détails de la réponse

Lisez la note de cours sur Solubility Of Substances (Ghana Only) (WAEC)

Solubility Of Substances (Ghana Only)

Voir la réponse

Question 14 Rapport

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

16.0

16.2 Bonne réponse

17.0

17.8

Détails de la réponse

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

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

Atomic Structure And Bonding

Voir la réponse

Question 15 Rapport

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

D 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 16 Rapport

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 Bonne réponse

Neutrons 36, Protons 17

Détails de la réponse

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

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

Atomic Structure And Bonding

Voir la réponse

Question 17 Rapport

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 Bonne réponse

alkanol

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

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

CH3 = CHCH3

CH3 ≡ CCH3 Bonne réponse

HC = C-CH2CH3

CH2 = CH-CH = CH2

Détails de la réponse

HC = C-CH2CH3

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

Periodic Chemistry (Ghana Only)

Voir la réponse

Question 19 Rapport

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 Bonne réponse

0.150 M

0.940 M

1.500 M

Détails de la réponse

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

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

Acids, Bases And Salts

Voir la réponse

Question 20 Rapport

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

burning off the oil layer

spraying with detergent Bonne réponse

dispersal with compressed air

spraying with hot water

Détails de la réponse

Lisez la note de cours sur Environmental Pollution (JAMB)

Environmental Pollution

Voir la réponse

Question 21 Rapport

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

ionic

covalent Bonne réponse

neutral

co-ordinate

Détails de la réponse

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

Atomic Structure And Bonding

Voir la réponse

Question 22 Rapport

Complete oxidation of propan -1- ol gives?

propanal

propan-2-al

propan-1-one

propanoic acid 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 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 Bonne réponse

ii only

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 24 Rapport

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 Bonne réponse

passing it directly through calcium chloride

Détails de la réponse

Lisez la note de cours sur Chemical Industry And Environment (WAEC)

Chemical Industry And Environment

Voir la réponse

Question 25 Rapport

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 Bonne réponse

Détails de la réponse

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

Energy And Energy Changes

Voir la réponse

Question 26 Rapport

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 Bonne réponse

higher the possibility of the substance formed being a molecul

Détails de la réponse

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

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

Chemical Bonds (Ghana Only)

Atomic Structure And Bonding

Voir la réponse

Question 27 Rapport

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

branched chain alkanes Bonne réponse

straight chain alkanes

cycloalkanes

halogenated hydrocarbons

Détails de la réponse

Voir la réponse

Question 28 Rapport

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 Bonne réponse

oxymethane flame

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 29 Rapport

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 Bonne réponse

r = kd

r =k/d

r = k √d

Détails de la réponse

r = k /√d

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

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 Bonne réponse

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 31 Rapport

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 Bonne réponse

iodine solution

sodium trioxocarbonate (IV) solution

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

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

trichloromethane

triodomethane Bonne réponse

iodoethane

ethanal

Détails de la réponse

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

Acids, Bases And Salts

Voir la réponse

Question 33 Rapport

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 Bonne réponse

emporarily hard water after boiling

Rain water stored in a glass jar for two years

Permanent hard water passed through permuitit

Détails de la réponse

Lisez la note de cours sur Water (JAMB)

Water

Voir la réponse

Question 34 Rapport

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 Bonne réponse

chlorine

oxygen

sulphur (IV) oxide

Détails de la réponse

Lisez la note de cours sur Chemical Combination (JAMB)

Chemical Combination

Voir la réponse






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