JAMB UTME - Chemistry - 1986

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Pergunta 5 Relatório

Starch can be converted to ethyl alcohol by?

distillation

fermentation

isomerization

cracking

Detalhes da Resposta

Read lesson note on Electrolysis (JAMB)

Electrolysis

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Pergunta 6 Relatório

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}}

Detalhes da Resposta

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)

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Pergunta 7 Relatório

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

CnH2n2X

CnH2n + 1X

CnH2n + 2X

CnH2nX

Detalhes da Resposta

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

Read lesson note on Chemical Equilibra (JAMB)

Chemical Equilibra

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Pergunta 8 Relatório

Ammonia gas is normally dried with?

concentrated sulphuric acid

quicklime

anhydrous calcium chloride

magnesium sulphate

Detalhes da Resposta

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

Acids, Bases And Salts (Ghana Only)

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Pergunta 9 Relatório

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

KCI

NaNO3

K2SO4

CaSO4

Detalhes da Resposta

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

Acids, Bases And Salts

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Pergunta 10 Relatório

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

Detalhes da Resposta

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

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Pergunta 11 Relatório

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

excess Mg ribbon

excess cold water

very hot water

steam

Detalhes da Resposta

Read lesson note on Chemical Combination (JAMB)

Chemical Combination

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Pergunta 12 Relatório

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

Detalhes da Resposta

Read lesson note on Stoichiometry And Chemical Reactions (WAEC)

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Pergunta 13 Relatório

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

Detalhes da Resposta

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

Chemistry Of Carbon Compounds (Nigeria Only)

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Pergunta 14 Relatório

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

Detalhes da Resposta

Read lesson note on Chemical Combination (JAMB)

Chemical Combination

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Pergunta 15 Relatório

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

Detalhes da Resposta

Read lesson note on Electrolysis (JAMB)

Electrolysis

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Pergunta 16 Relatório

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

Detalhes da Resposta

Read lesson note on Environmental Pollution (JAMB)

Environmental Pollution

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Pergunta 17 Relatório

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

Detalhes da Resposta

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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Pergunta 18 Relatório

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-

Detalhes da Resposta

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)

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Pergunta 19 Relatório

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

oxidized to ethene

polymerized to polyethene

dehydrated to ethene

dehydrated to ethyne

Detalhes da Resposta

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Pergunta 20 Relatório

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

Detalhes da Resposta

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

Acids, Bases And Salts

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Pergunta 21 Relatório

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

Detalhes da Resposta

Read lesson note on Electrolysis (JAMB)

Electrolysis

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Pergunta 22 Relatório

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

HCl

HOCl

Cl2O

Detalhes da Resposta

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

Acids, Bases And Salts

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Pergunta 23 Relatório

Which of these represents a redox reaction?

AgNO3 + NaCl → AgCAl + NaNO3

H2S + Pb(NO3) → PbS + 2HNO3

CaCO3 → CaO + CO2

Zn + 2HCl → ZnCl2 + H2

Detalhes da Resposta

Read lesson note on Redox Reactions (WAEC)

Redox Reactions

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Pergunta 24 Relatório

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

Neutralization

Saponification

Esterification

Salting-out

Detalhes da Resposta

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

Acids, Bases And Salts

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Pergunta 25 Relatório

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

Detalhes da Resposta

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

Acids, Bases And Salts

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Pergunta 26 Relatório

Which of the following does NOT contain aluminium as component?

Over-head cables

Duralumin

Container for caustic soda

Container for nitric acid

Detalhes da Resposta

Read lesson note on Metals And Their Compounds (JAMB)

Metals And Their Compounds

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Pergunta 27 Relatório

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

CH3CI

C2H5CI

CH2CI2

CHCI3

Detalhes da Resposta

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

Chemistry Of Carbon Compounds (Nigeria Only)

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Pergunta 28 Relatório

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

Detalhes da Resposta

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

Chemistry Of Carbon Compounds (Nigeria Only)

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Pergunta 29 Relatório

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

20 cm3

25 cm3

50 cm3

100 cm3

Detalhes da Resposta

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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Pergunta 30 Relatório

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

Detalhes da Resposta

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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Pergunta 31 Relatório

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

Detalhes da Resposta

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

Chemical Kinetics And Equilibrium Systems (Ghana Only)

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Pergunta 32 Relatório

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

Detalhes da Resposta

Read lesson note on Stoichiometry And Chemical Reactions (WAEC)

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Pergunta 33 Relatório

Which of the following sulphides is insoluble in dilute HCl?

Na2S

ZnS

CuS

FeS

Detalhes da Resposta

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

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Pergunta 34 Relatório

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

Detalhes da Resposta

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

Acids, Bases And Salts

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Pergunta 35 Relatório

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

Detalhes da Resposta

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

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Pergunta 36 Relatório

Which of the following is an acidic salt?

NaHSO4

Na2SO4

CH3CO2Na

Na2S

Detalhes da Resposta

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)

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Pergunta 37 Relatório

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

Detalhes da Resposta

Read lesson note on Solubility (JAMB)

Solubility

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Pergunta 38 Relatório

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

none of the options is correct

Detalhes da Resposta

Read lesson note on Metals And Their Compounds (JAMB)

Metals And Their Compounds

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Pergunta 39 Relatório

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

Detalhes da Resposta

Read lesson note on Stoichiometry And Chemical Reactions (WAEC)

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Pergunta 40 Relatório

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

Detalhes da Resposta

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)