JAMB UTME - Chemistry - 1987 | Green Bridge CBT

Question 1 Report

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 Correct answer

0.150 M

0.940 M

1.500 M

Answer Details

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

Read lesson note on Acids, Bases And Salts (JAMB)

Acids, Bases And Salts

View Answer

Question 2 Report

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 Correct answer

the six orbitals hybridize to four

Answer Details

both the 2s and 2p orbitals hydrodizes

Read lesson note on Atomic Structure And Bonding (JAMB)

Atomic Structure And Bonding

View Answer

Question 3 Report

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 Correct answer

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

Answer Details

Read lesson note on Acids, Bases And Salts (JAMB)

Acids, Bases And Salts

View Answer

Question 4 Report

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 Correct answer

emporarily hard water after boiling

Rain water stored in a glass jar for two years

Permanent hard water passed through permuitit

Answer Details

Read lesson note on Water (JAMB)

Water

View Answer

Question 5 Report

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 Correct answer

chlorine

oxygen

sulphur (IV) oxide

Answer Details

Read lesson note on Chemical Combination (JAMB)

Chemical Combination

View Answer

Question 6 Report

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 Correct answer

higher the possibility of the substance formed being a molecul

Answer Details

Read lesson note on Chemical Bonds (Ghana Only) (WAEC)

Read lesson note on Atomic Structure And Bonding (JAMB)

Chemical Bonds (Ghana Only)

Atomic Structure And Bonding

View Answer

Question 7 Report

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 Correct answer

iodine solution

sodium trioxocarbonate (IV) solution

Answer Details

Read lesson note on Acids, Bases And Salts (Ghana Only) (WAEC)

Acids, Bases And Salts (Ghana Only)

View Answer

Question 8 Report

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 Correct answer

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

Answer Details

Read lesson note on Kinetic Theory Of Matter And Gas Laws (JAMB)

Kinetic Theory Of Matter And Gas Laws

View Answer

Question 9 Report

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

CH3 = CHCH3

CH3 ≡ CCH3 Correct answer

HC = C-CH2CH3

CH2 = CH-CH = CH2

Answer Details

HC = C-CH2CH3

Read lesson note on Periodic Chemistry (Ghana Only) (WAEC)

Periodic Chemistry (Ghana Only)

View Answer

Question 10 Report

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 Correct answer

Answer Details

Read lesson note on Solubility (JAMB)

Solubility

View Answer

Question 11 Report

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

Al Correct answer

Answer Details

Read lesson note on Non-metals And Their Compounds (JAMB)

Non-metals And Their Compounds

View Answer

Question 12 Report

Complete oxidation of propan -1- ol gives?

propanal

propan-2-al

propan-1-one

propanoic acid Correct answer

Answer Details

Read lesson note on Chemistry Of Carbon Compounds (Nigeria Only) (WAEC)

Chemistry Of Carbon Compounds (Nigeria Only)

View Answer

Question 13 Report

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 Correct answer

Answer Details

Read lesson note on Metals And Their Compounds (JAMB)

Metals And Their Compounds

View Answer

Question 14 Report

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% Correct answer

13.7%

Answer Details

Read lesson note on Solubility Of Substances (Ghana Only) (WAEC)

Solubility Of Substances (Ghana Only)

View Answer

Question 15 Report

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

16.0

16.2 Correct answer

17.0

17.8

Answer Details

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

Read lesson note on Atomic Structure And Bonding (JAMB)

Atomic Structure And Bonding

View Answer

Question 16 Report

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 Correct answer

Decrease in the concentration of SO2(g)

Answer Details

Read lesson note on Kinetic Theory Of Matter And Gas Laws (JAMB)

Kinetic Theory Of Matter And Gas Laws

View Answer

Question 17 Report

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

D Correct answer

Answer Details

Read lesson note on Chemistry Of Carbon Compounds (Nigeria Only) (WAEC)

Chemistry Of Carbon Compounds (Nigeria Only)

View Answer

Question 18 Report

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 Correct answer

water vapour, N2 and the inert gases

Answer Details

Read lesson note on Kinetic Theory Of Matter And Gas Laws (JAMB)

Kinetic Theory Of Matter And Gas Laws

View Answer

Question 19 Report

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 Correct answer

alkanol

Answer Details

Read lesson note on Acids, Bases And Salts (JAMB)

Acids, Bases And Salts

View Answer

Question 20 Report

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 Correct answer

Answer Details

Read lesson note on Energy And Energy Changes (WAEC)

Energy And Energy Changes

View Answer

Question 21 Report

Stainless steel is an alloy of?

Iron, carbon and silver

iron, carbon and lead

iron, carbon and chromium Correct answer

iron and carbon only

Answer Details

Read lesson note on Oxidation And Reduction (JAMB)

Oxidation And Reduction

View Answer

Question 22 Report

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

branched chain alkanes Correct answer

straight chain alkanes

cycloalkanes

halogenated hydrocarbons

Answer Details

View Answer

Question 23 Report

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 Correct answer

Answer Details

Read lesson note on Separation Of Mixtures And Purification Of Chemical Substances (JAMB)

Separation Of Mixtures And Purification Of Chemical Substances

View Answer

Question 24 Report

Corrosion is exhibited by

iron only

electropostive metals

metals below hydrogen inthe electrochemical series

all metals Correct answer

Answer Details

Read lesson note on Acids, Bases And Salts (JAMB)

Acids, Bases And Salts

View Answer

Question 25 Report

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 Correct answer

ii only

Answer Details

Read lesson note on Kinetic Theory Of Matter And Gas Laws (JAMB)

Kinetic Theory Of Matter And Gas Laws

View Answer

Question 26 Report

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

burning off the oil layer

spraying with detergent Correct answer

dispersal with compressed air

spraying with hot water

Answer Details

Read lesson note on Environmental Pollution (JAMB)

Environmental Pollution

View Answer

Question 27 Report

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 Correct answer

r = kd

r =k/d

r = k √d

Answer Details

r = k /√d

Read lesson note on Kinetic Theory Of Matter And Gas Laws (JAMB)

Kinetic Theory Of Matter And Gas Laws

View Answer

Question 28 Report

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

trichloromethane

triodomethane Correct answer

iodoethane

ethanal

Answer Details

Read lesson note on Acids, Bases And Salts (JAMB)

Acids, Bases And Salts

View Answer

Question 29 Report

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 Correct answer

Answer Details

Read lesson note on Atomic Structure And Bonding (JAMB)

Atomic Structure And Bonding

View Answer

Question 30 Report

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 Correct answer

Neutrons 36, Protons 17

Answer Details

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

Read lesson note on Atomic Structure And Bonding (JAMB)

Atomic Structure And Bonding

View Answer

Question 31 Report

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