JAMB UTME - Chemistry - 1986 | Green Bridge CBT

Question 1 Report

How will a metal X, which reacts explosively with air and with dilute acids be best extracted from its ores?

Electrolysis of solution of its salts

Decomposition of its oxides

Displacement from solution by an alkali metal

Electroiysis of fused salt

Answer Details

Read lesson note on Metals And Their Compounds (JAMB)

Metals And Their Compounds

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Question 2 Report

20 cm3 of 1.0 molar NH4OH solution when neutralized with 20.05cm3 of 0.1 molar HCl liberated -102 joules of heat. Calculate the heat of neutralization of NH4OH?

-51.O KJ mol-

+57.3 KJ mol-

+57.O KJ mol-

+51.0 KJ mol-

Answer Details

NH4OH = 20cm of 0.1 m
NH4 + HCl → NH4Cl = H2O
Heat of Neutralization of NH4OH
=

\frac{- 102}{2}

= -51.0 KJ mole-1

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

Kinetic Theory Of Matter And Gas Laws

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Question 3 Report

The tabulated results below were obtained by titration 10.0 cm3 of water with soup. The titration was repeated with the same sample of water after boiling. The ratio of permanent to temporary hardness is

1.5

1.4

4.1

5.1

Answer Details

The ratio of permanent to temporary hardness will be 20:(20 - 15)

= 20:5

= 4:1

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

Acids, Bases And Salts

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Question 4 Report

When ethanol is heated with excess concentrated sulphuric acid, the ethanol is?

oxidized to ethene

polymerized to polyethene

dehydrated to ethene

dehydrated to ethyne

Answer Details

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Question 5 Report

An element with atomic number twelve is likely to be

electrovalent with a velocity of 1

electrovalent with a valency of 2

covalent with a valency of 2

covalent with valency of 4

Answer Details

Read lesson note on Chemical Combination (JAMB)

Read lesson note on Atomic Structure And Bonding (JAMB)

Chemical Combination

Atomic Structure And Bonding

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Question 6 Report

10cm3 of hydrogen fluoride gas react with 5cm3 of dinitrogen difluoride gas (N2F2) to form 103 of a single gas. Which of the following is the most likely equation of the reaction?

HF + N2F2

\to

N2HF3

2HF + N2F2

\to

2NHF2

2HF + N2F2

\to

N2H2F3

HF + 2N2F2

\to

N4HF2

Answer Details

Read lesson note on Stoichiometry And Chemical Reactions (WAEC)

Stoichiometry And Chemical Reactions

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Question 7 Report

Ammonia gas is normally dried with?

concentrated sulphuric acid

quicklime

anhydrous calcium chloride

magnesium sulphate

Answer Details

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

Acids, Bases And Salts (Ghana Only)

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Question 8 Report

Which of the following is NOT correct test for the named organic compound in each case?

Butanoic acid solution gives effervescence with Na2CO3 solution

Glucose when reacted with Na2CrO4 at 0°C will show immediate discharge of colour

When but-2-ene is reacted with dilute solution of KMnO4 the purple colour of KMnO is discharged readily even room temperature

When butan-2-ol is boiled with butanoic acid with a drop of concentrated H2SO4 a sweet smelling liquid is produced

Answer Details

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

Chemistry Of Carbon Compounds (Nigeria Only)

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Question 9 Report

Which of the following salts when dissolved in water will NOT give the corresponding pH value?

NaHSO4, pH < 5

Na2CO3, pH > 8

Na2Cl,pH = 7

NaHCO, pH < 6

Answer Details

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

Acids, Bases And Salts

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Question 10 Report

Which of the following solutions will conduct the least amount of electricity?

2.00 M aqueous solution of NaOH

0.01 M aqueous solution of NaOH

0.01 M aqueous solution of hexanoic acid

0.01 M aqueous solution of sugar

Answer Details

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

Non-metals And Their Compounds

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Question 11 Report

In the electrolysis of aqueous solution of K2SO 4 in the above cell, which species migrate to the anode?

SO2-OH -

K + and SO 42-

OH and HO

H3O + and K

Answer Details

Read lesson note on Electrolysis (JAMB)

Electrolysis

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Question 12 Report

Oxygen-demanding waste are considered to be a water pollutant because they?

deplete oxygen which is necessary for the survival of aquatic organism

increase oxygen which is necessary for survival of aquatic organism

increase other gaseous substances which are necessary for the survival of aquatic organisms

deplete other gaseous species which is necessary for the survival of aquatic organisms

Answer Details

Read lesson note on Environmental Pollution (JAMB)

Environmental Pollution

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Question 13 Report

What reaction takes place when palm-oil is added to potash and foam are observed?

Neutralization

Saponification

Esterification

Salting-out

Answer Details

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

Acids, Bases And Salts

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Question 14 Report

Which of the following is an acidic salt?

NaHSO4

Na2SO4

CH3CO2Na

Na2S

Answer Details

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

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

Acids, Bases And Salts (Ghana Only)

Periodic Chemistry (Ghana Only)

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Question 15 Report

A substance Z reacts with NaOH to give salt and water only. When Z is treated with dilute HCl, a gas is evolved which gives a yellow suspension on passing into concentrated H2SO4. Substance Z is?

NaHS

Na2SO3

Na2S

NaHSO3

Answer Details

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

Acids, Bases And Salts

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Question 16 Report

The movement of liquid molecules from the surface of the liquid to the gaseous phase above it is known as?

Brownian movement

condensation

evaporation

liquefaction

Answer Details

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

Kinetic Theory Of Matter And Gas Laws

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Question 17 Report

In the solubility curve above, water at 98oC is saturated with KCL and KCIO3 What is the percentage of KCL impurity in the crystals formed when the solution is cooled to 30 oC?

51.5

45.5

34.5

26.5

Answer Details

Read lesson note on Solubility (JAMB)

Solubility

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Question 18 Report

Which of the following compounds is NOT formed by the action of chlorine on methane?

CH3CI

C2H5CI

CH2CI2

CHCI3

Answer Details

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

Chemistry Of Carbon Compounds (Nigeria Only)

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Question 19 Report

What is the consequences of increasing pressure on the equilibrium reaction ZnO(s) + H2(g) Zn(s) + H2O(I)?

The equilibrium is driven to the left

The equilibrium is driven to the right

There is no effect

More ZnO is produced

Answer Details

Read lesson note on Chemical Kinetics And Equilibrium Systems (Ghana Only) (WAEC)

Chemical Kinetics And Equilibrium Systems (Ghana Only)

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Question 20 Report

Which of the following does NOT contain aluminium as component?

Over-head cables

Duralumin

Container for caustic soda

Container for nitric acid

Answer Details

Read lesson note on Metals And Their Compounds (JAMB)

Metals And Their Compounds

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Question 21 Report

When steam is passed through red hot carbon, which of the following are produced?

Hydrogen oxygen and carbon (IV) oxide

Hydrogen and carbon (IV) oxide

Hydrogen and carbon (II) oxide

Hydrogen and trioxocarbonate (IV) acid

Answer Details

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

Separation Of Mixtures And Purification Of Chemical Substances

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Question 22 Report

Which of the following groups of physical properties increases from left to right of the periodic table? i. Ionization energy ii. Atomic radius iii. Electronegativity iv. Electro affinity

i and ii

i, ii and iii

iii and iv

i, ii, iii and iv

Answer Details

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

Periodic Chemistry (Nigeria Only)

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Question 23 Report

Use the options above to answer this question. Which is the structural formula for pent-2-enoic acid?

Answer Details

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

Chemistry Of Carbon Compounds (Nigeria Only)

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Question 24 Report

The number of atoms of chlorine present in 5.85g of NaCl is [Avogaro's Number = 6.02 x 1023]

6.02 x 1022

5.85 x 1023

6.02 x 1023

5.85 x 1024

Answer Details

The number of atoms of chloride present in 5.85g of NaCl is 5.85 x 6.0 x 1023

= 6.02 x 1022

Read lesson note on Stoichiometry And Chemical Reactions (WAEC)

Stoichiometry And Chemical Reactions

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Question 25 Report

The exhaust fumes from a garage in a place that uses petrol of high sulphur content are bound to contain?

CO and SO3

CO and SO2

CO,SO2 and SO3

CO and H2S

Answer Details

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

Acids, Bases And Salts

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Question 26 Report

In the course of an experiment, two gases X and Y were produced. X turned wet lead ethanoate to black and Y bleached moist litmus paper. What are the element(s) in each of the gases X and Y respectively?

H and S;Cl

H and O;Cl

H and S;C and O

H and Cl;S and O

Answer Details

Read lesson note on Chemical Combination (JAMB)

Chemical Combination

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Question 27 Report

How many coulombs of electricity are passed through a solution in which 6.5 amperes are allowed to run for 1.0 hour?

3.90 x 102 coulombs

5.50 x 103 coulombs

6.54 x 103 coulombs

2.34 x 104 coulombs

Answer Details

Read lesson note on Electrolysis (JAMB)

Electrolysis

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Question 28 Report

When chlorine is passed into water and subsequently exposed to sunlight, the gas evolved is?

HCl

HOCl

Cl2O

Answer Details

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

Acids, Bases And Salts

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Question 29 Report

The approximate volume of air containing 10cm3 of oxygen is?

20 cm3

25 cm3

50 cm3

100 cm3

Answer Details

Volume of air containing 10 cm O2 is
(100 x 10)/(20) = 50cm3

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

Separation Of Mixtures And Purification Of Chemical Substances

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Question 30 Report

Starch can be converted to ethyl alcohol by?

distillation

fermentation

isomerization

cracking

Answer Details

Read lesson note on Electrolysis (JAMB)

Electrolysis

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Question 31 Report

What mass of a divalent metal M (atomic mass = 40) would react with excess hydrogen gas measured at S.T.P?

8.0 g

4.0 g

0.8 g

0.4 g

Answer Details

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

Kinetic Theory Of Matter And Gas Laws

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Question 32 Report

Which of the following compounds would give lilac flame coloration and a white precipitate with acidified barium chloride solution?

KCI

NaNO3

K2SO4

CaSO4

Answer Details

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

Acids, Bases And Salts

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Question 33 Report

The iron (III) oxide impurity in bauxite can be removed by?

Fractional crystallization in acid solution

dissolution in sodium hydroxide and filtration

extraction with concentrated ammonia and reprecipitation

electroysis of molten mixture

Answer Details

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

Acids, Bases And Salts

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Question 34 Report

The relationship between the velocity (U) of gas molecules and their relative molecular mass (M) is shown by the equation

U = (kM)

\frac{1}{2}

U = (kM)2

U =

\sqrt{k} m

U = (

\frac{k}{m}

)

^{\frac{1}{2}}

Answer Details

The relationship between (U) of a gas molecule and the relative molecular mass is

\bar{U}

= (

\frac{k}{m}

)

^{\frac{1}{2}}

or $\bar{U}$ = $\sqrt{k} m$

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

Kinetic Theory Of Matter And Gas Laws

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Question 35 Report

Which of these represents a redox reaction?

AgNO3 + NaCl → AgCAl + NaNO3

H2S + Pb(NO3) → PbS + 2HNO3

CaCO3 → CaO + CO2

Zn + 2HCl → ZnCl2 + H2

Answer Details

Read lesson note on Redox Reactions (WAEC)

Redox Reactions

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Question 36 Report

The reaction Mg + H2O → MgO + H2 takes place only in the presence of?

excess Mg ribbon

excess cold water

very hot water

steam

Answer Details

Read lesson note on Chemical Combination (JAMB)

Chemical Combination

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Question 37 Report

What are the values of x, y and z respectively in the equation: xCu + yHNO3 ? xCu(NO3)2 + 4H2O + zNO?

4: 1: 2

3:8:2

2:8:3

8:3:2

Answer Details

Read lesson note on Stoichiometry And Chemical Reactions (WAEC)

Stoichiometry And Chemical Reactions

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Question 38 Report

How much of magnesium is required to react with 260cm3 of 0.5 M HCl? [Mg = 24]

0.3g

1.5g

2.4g

3.0g

Answer Details

Read lesson note on Stoichiometry And Chemical Reactions (WAEC)

Stoichiometry And Chemical Reactions

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Question 39 Report

Which of the following metals does NOT form a stable trioxocarbonate (IV)?

none of the options is correct

Answer Details

Read lesson note on Metals And Their Compounds (JAMB)

Metals And Their Compounds

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Question 40 Report

Which of the following sulphides is insoluble in dilute HCl?

Na2S

ZnS

CuS

FeS

Answer Details

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

Periodic Chemistry (Ghana Only)

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Question 41 Report

Which of the following substances is a mixture?

granulated sugar

sea water

sodium chloride

Iron fillings

Answer Details

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

Separation Of Mixtures And Purification Of Chemical Substances

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Question 42 Report

A white solid suspected to be lead trioxonitrate (V) zinc trioxocarbonate (IV) or calcium trioxocabonate (IV) was heated strongly. Its residue which was yellow when hot and white when cold is?

lead (II) oxide

calcium oxide

zinc oxide

lead nitrate

Answer Details

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

Periodic Chemistry (Ghana Only)

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Question 43 Report

Which of the following will react further with oxygen to form higher oxide?

NO and H2O

CO and CO2

SO2 and NO

CO2 and H2O

Answer Details

Read lesson note on Oxidation And Reduction (JAMB)

Oxidation And Reduction

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Question 44 Report

Which of the following is used as an 'anti-knock' in automobile engines?

Tetramethyl silane

Lead tetra-ethyl

Glycerol

n-heptane

Answer Details

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

Acids, Bases And Salts

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Question 45 Report

When 50cm3 of a saturated solution of sugar (molar mass 342.0g) at 40oC was evaporated to dryness, 34.2g of dry solid was obtained. The solubility of sugar at 40oC is

10.0 moles dm-3

7.0 moles dm-3

3.5 moles dm-3

2.0 moles dm-3

Answer Details

Read lesson note on Solubility (JAMB)

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

Solubility

Solubility Of Substances (Ghana Only)

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Question 46 Report

The general formula of an alkyl halide (where X represents the halide) is?