JAMB UTME - Chemistry - 1986

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Question 2 Report

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

CH3CI

C2H5CI Correct answer

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 3 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 Correct answer

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 4 Report

Which of the following sulphides is insoluble in dilute HCl?

Na2S

ZnS

CuS Correct answer

FeS

Answer Details

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

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Question 5 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 Correct answer

lead nitrate

Answer Details

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

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Question 6 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 Correct answer

Answer Details

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

Non-metals And Their Compounds

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Question 7 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 Correct answer

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

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

Chemistry Of Carbon Compounds (Nigeria Only)

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Question 8 Report

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

excess Mg ribbon

excess cold water

very hot water

steam Correct answer

Answer Details

Read lesson note on Chemical Combination (JAMB)

Chemical Combination

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Question 9 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 Correct answer

2HF + N2F2

\to

N2H2F3

HF + 2N2F2

\to

N4HF2

Answer Details

Read lesson note on Stoichiometry And Chemical Reactions (WAEC)

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Question 10 Report

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

Fractional crystallization in acid solution Correct answer

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 11 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 Correct answer

26.5

Answer Details

Read lesson note on Solubility (JAMB)

Solubility

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Question 12 Report

Which of the following substances is a mixture?

granulated sugar

sea water Correct answer

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 13 Report

Which of the following does NOT contain aluminium as component?

Over-head cables

Duralumin

Container for caustic soda

Container for nitric acid Correct answer

Answer Details

Read lesson note on Metals And Their Compounds (JAMB)

Metals And Their Compounds

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Question 14 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 Correct answer

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 15 Report

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

KCI

NaNO3

K2SO4 Correct answer

CaSO4

Answer Details

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

Acids, Bases And Salts

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Question 16 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- Correct answer

+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)

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Question 17 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 Correct answer

Answer Details

Read lesson note on Metals And Their Compounds (JAMB)

Metals And Their Compounds

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Question 18 Report

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

oxidized to ethene

polymerized to polyethene

dehydrated to ethene Correct answer

dehydrated to ethyne

Answer Details

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Question 19 Report

Which of these represents a redox reaction?

AgNO3 + NaCl → AgCAl + NaNO3

H2S + Pb(NO3) → PbS + 2HNO3

CaCO3 → CaO + CO2

Zn + 2HCl → ZnCl2 + H2 Correct answer

Answer Details

Read lesson note on Redox Reactions (WAEC)

Redox Reactions

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Question 20 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 Correct answer

Answer Details

Read lesson note on Electrolysis (JAMB)

Electrolysis

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Question 21 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 Correct answer

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 22 Report

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

SO2-OH - Correct answer

K + and SO 42-

OH and HO

H3O + and K

Answer Details

Read lesson note on Electrolysis (JAMB)

Electrolysis

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Question 23 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

Correct answer

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)

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Question 24 Report

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

CnH2n2X

CnH2n + 1X Correct answer

CnH2n + 2X

CnH2nX

Answer Details

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

Read lesson note on Chemical Equilibria (JAMB)

Chemical Equilibria

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Question 25 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 Correct answer

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 26 Report

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

C Correct answer

Answer Details

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

Chemistry Of Carbon Compounds (Nigeria Only)

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Question 27 Report

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

none of the options is correct Correct answer

Answer Details

Read lesson note on Metals And Their Compounds (JAMB)

Metals And Their Compounds

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Question 28 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
Correct answer

Answer Details

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

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Question 29 Report

Ammonia gas is normally dried with?

concentrated sulphuric acid

quicklime Correct answer

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 30 Report

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

20 cm3

25 cm3

50 cm3 Correct answer

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 31 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 Correct answer

liquefaction

Answer Details

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

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Question 32 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 Correct answer

Answer Details

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

Acids, Bases And Salts

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Question 33 Report

Which of the following is an acidic salt?

NaHSO4 Correct answer

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)

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Question 34 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 Correct answer

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)

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Question 35 Report

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

0.3g

1.5g Correct answer

2.4g

3.0g

Answer Details

Read lesson note on Stoichiometry And Chemical Reactions (WAEC)