JAMB UTME - Chemistry - 1987 | Green Bridge CBT

Pergunta 1 Relatório

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 Resposta correta

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Pergunta 2 Relatório

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 Resposta correta

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

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Pergunta 3 Relatório

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 Resposta correta

passing it directly through calcium chloride

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Pergunta 4 Relatório

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 Resposta correta

oxymethane flame

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Pergunta 5 Relatório

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

branched chain alkanes Resposta correta

straight chain alkanes

cycloalkanes

halogenated hydrocarbons

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Pergunta 6 Relatório

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 Resposta correta

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Solubility

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Pergunta 7 Relatório

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

Al Resposta correta

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Pergunta 8 Relatório

Stainless steel is an alloy of?

Iron, carbon and silver

iron, carbon and lead

iron, carbon and chromium Resposta correta

iron and carbon only

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Pergunta 9 Relatório

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 Resposta correta

iodine solution

sodium trioxocarbonate (IV) solution

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Pergunta 10 Relatório

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 Resposta correta

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Separation Of Mixtures And Purification Of Chemical Substances

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Pergunta 11 Relatório

Corrosion is exhibited by

iron only

electropostive metals

metals below hydrogen inthe electrochemical series

all metals Resposta correta

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Pergunta 12 Relatório

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 Resposta correta

the six orbitals hybridize to four

Detalhes da Resposta

both the 2s and 2p orbitals hydrodizes

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Pergunta 13 Relatório

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

16.0

16.2 Resposta correta

17.0

17.8

Detalhes da Resposta

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

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Pergunta 14 Relatório

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 Resposta correta

Neutrons 36, Protons 17

Detalhes da Resposta

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

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Pergunta 15 Relatório

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 Resposta correta

water vapour, N2 and the inert gases

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Pergunta 16 Relatório

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

burning off the oil layer

spraying with detergent Resposta correta

dispersal with compressed air

spraying with hot water

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Pergunta 17 Relatório

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

CH3 = CHCH3

CH3 ≡ CCH3 Resposta correta

HC = C-CH2CH3

CH2 = CH-CH = CH2

Detalhes da Resposta

HC = C-CH2CH3

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Pergunta 18 Relatório

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 Resposta correta

0.150 M

0.940 M

1.500 M

Detalhes da Resposta

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

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Pergunta 19 Relatório

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 Resposta correta

Decrease in the concentration of SO2(g)

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Pergunta 20 Relatório

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 Resposta correta

chlorine

oxygen

sulphur (IV) oxide

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Pergunta 21 Relatório

Complete oxidation of propan -1- ol gives?

propanal

propan-2-al

propan-1-one

propanoic acid Resposta correta

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Pergunta 22 Relatório

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 Resposta correta

emporarily hard water after boiling

Rain water stored in a glass jar for two years

Permanent hard water passed through permuitit

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Water

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Pergunta 23 Relatório

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 Resposta correta

alkanol

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Pergunta 24 Relatório

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 Resposta correta

higher the possibility of the substance formed being a molecul

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Pergunta 25 Relatório

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 Resposta correta

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Pergunta 26 Relatório

Synthetic rubber is made by polymerization of?

2 methyl buta - 1, 3 - diene Resposta correta

2 methyl buta - 1, 2 - diene

2 methyl but -1-ene

2 methyl but-2-ene

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Pergunta 27 Relatório

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

ionic

covalent Resposta correta

neutral

co-ordinate

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Pergunta 28 Relatório

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 Resposta correta

r = kd

r =k/d

r = k √d

Detalhes da Resposta

r = k /√d

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Pergunta 29 Relatório

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 Resposta correta

ii only

Detalhes da Resposta

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Pergunta 30 Relatório

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 Resposta correta

Detalhes da Resposta

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Pergunta 31 Relatório

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

D Resposta correta

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Chemistry Of Carbon Compounds (Nigeria Only)

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Pergunta 32 Relatório

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% Resposta correta

13.7%

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Pergunta 33 Relatório

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

trichloromethane

triodomethane Resposta correta

iodoethane

ethanal

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Pergunta 34 Relatório

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 Resposta correta

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

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