JAMB UTME - Chemistry - 1986 | Green Bridge CBT

Pregunta 1 Informe

Which of the following are made by the process of polymerization?

Nylon and soap

Nylon and artificial rubber

Soap and butane

Margarine and nylon

Detalles de la respuesta

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

Read lesson note on Basic Biochemistry And Synthetic Polymers (WAEC)

Chemistry Of Carbon Compounds (Nigeria Only)

Basic Biochemistry And Synthetic Polymers

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Pregunta 2 Informe

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

Detalles de la respuesta

Read lesson note on Solubility (JAMB)

Solubility

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Pregunta 3 Informe

Which of the following is an acidic salt?

NaHSO4

Na2SO4

CH3CO2Na

Na2S

Detalles de la respuesta

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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Pregunta 4 Informe

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

CnH2n2X

CnH2n + 1X

CnH2n + 2X

CnH2nX

Detalles de la respuesta

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

Read lesson note on Chemical Equilibra (JAMB)

Periodic Chemistry (Ghana Only)

Chemical Equilibra

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Pregunta 5 Informe

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-

Detalles de la respuesta

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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Pregunta 6 Informe

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

Detalles de la respuesta

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

Non-metals And Their Compounds

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Pregunta 7 Informe

Which of the following substances is a mixture?

granulated sugar

sea water

sodium chloride

Iron fillings

Detalles de la respuesta

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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Pregunta 8 Informe

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

Detalles de la respuesta

Read lesson note on Stoichiometry And Chemical Reactions (WAEC)

Stoichiometry And Chemical Reactions

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Pregunta 9 Informe

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

Detalles de la respuesta

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

Chemistry Of Carbon Compounds (Nigeria Only)

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Pregunta 10 Informe

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

none of the options is correct

Detalles de la respuesta

Read lesson note on Metals And Their Compounds (JAMB)

Metals And Their Compounds

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Pregunta 11 Informe

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

Detalles de la respuesta

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

Chemistry Of Carbon Compounds (Nigeria Only)

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Pregunta 12 Informe

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

Detalles de la respuesta

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

Kinetic Theory Of Matter And Gas Laws

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Pregunta 13 Informe

Which of these represents a redox reaction?

AgNO3 + NaCl → AgCAl + NaNO3

H2S + Pb(NO3) → PbS + 2HNO3

CaCO3 → CaO + CO2

Zn + 2HCl → ZnCl2 + H2

Detalles de la respuesta

Read lesson note on Redox Reactions (WAEC)

Redox Reactions

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Pregunta 14 Informe

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

CH3CI

C2H5CI

CH2CI2

CHCI3

Detalles de la respuesta

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

Chemistry Of Carbon Compounds (Nigeria Only)

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Pregunta 15 Informe

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

Detalles de la respuesta

Read lesson note on Oxidation And Reduction (JAMB)

Oxidation And Reduction

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Pregunta 16 Informe

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

Detalles de la respuesta

Read lesson note on Metals And Their Compounds (JAMB)

Metals And Their Compounds

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Pregunta 17 Informe

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

Detalles de la respuesta

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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Pregunta 18 Informe

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

Detalles de la respuesta

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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Pregunta 19 Informe

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

Detalles de la respuesta

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

Kinetic Theory Of Matter And Gas Laws

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Pregunta 20 Informe

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

Detalles de la respuesta

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

Acids, Bases And Salts

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Pregunta 21 Informe

Which of the following does NOT contain aluminium as component?

Over-head cables

Duralumin

Container for caustic soda

Container for nitric acid

Detalles de la respuesta

Read lesson note on Metals And Their Compounds (JAMB)

Metals And Their Compounds

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Pregunta 22 Informe

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

Detalles de la respuesta

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Environmental Pollution

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Pregunta 23 Informe

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

oxidized to ethene

polymerized to polyethene

dehydrated to ethene

dehydrated to ethyne

Detalles de la respuesta

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Pregunta 24 Informe

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

Detalles de la respuesta

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

Periodic Chemistry (Ghana Only)

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Pregunta 25 Informe

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

Detalles de la respuesta

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

Acids, Bases And Salts

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Pregunta 26 Informe

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

excess Mg ribbon

excess cold water

very hot water

steam

Detalles de la respuesta

Read lesson note on Chemical Combination (JAMB)

Chemical Combination

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Pregunta 27 Informe

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

KCI

NaNO3

K2SO4

CaSO4

Detalles de la respuesta

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

Acids, Bases And Salts

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Pregunta 28 Informe

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

Neutralization

Saponification

Esterification

Salting-out

Detalles de la respuesta

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

Acids, Bases And Salts

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Pregunta 29 Informe

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

HCl

HOCl

Cl2O

Detalles de la respuesta

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

Acids, Bases And Salts

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Pregunta 30 Informe

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}}

Detalles de la respuesta

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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Pregunta 31 Informe

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

Detalles de la respuesta

Read lesson note on Stoichiometry And Chemical Reactions (WAEC)

Stoichiometry And Chemical Reactions

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Pregunta 32 Informe

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

Detalles de la respuesta

Read lesson note on Electrolysis (JAMB)

Electrolysis

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Pregunta 33 Informe

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

Detalles de la respuesta

Read lesson note on Chemical Combination (JAMB)

Chemical Combination

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Pregunta 34 Informe

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

Detalles de la respuesta

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

Acids, Bases And Salts

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Pregunta 35 Informe

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

Tetramethyl silane

Lead tetra-ethyl

Glycerol

n-heptane

Detalles de la respuesta

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

Acids, Bases And Salts

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Pregunta 36 Informe

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

Detalles de la respuesta

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

Acids, Bases And Salts

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Pregunta 37 Informe

Starch can be converted to ethyl alcohol by?

distillation

fermentation

isomerization

cracking

Detalles de la respuesta

Read lesson note on Electrolysis (JAMB)

Electrolysis

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Pregunta 38 Informe

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

Detalles de la respuesta

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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Pregunta 39 Informe

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

Detalles de la respuesta

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

Periodic Chemistry (Nigeria Only)

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Pregunta 40 Informe

Which of the following sulphides is insoluble in dilute HCl?

Na2S

ZnS