JAMB UTME - Chemistry - 1986

Wo Idahun

Ibeere 4 Ìròyìn

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

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Oxidation And Reduction (JAMB)

Oxidation And Reduction

Wo Idahun

Ibeere 5 Ìròyìn

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

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Environmental Pollution (JAMB)

Environmental Pollution

Wo Idahun

Ibeere 6 Ìròyìn

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

Tetramethyl silane

Lead tetra-ethyl

Glycerol

n-heptane

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Acids, Bases And Salts (JAMB)

Acids, Bases And Salts

Wo Idahun

Ibeere 7 Ìròyìn

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

CH3CI

C2H5CI

CH2CI2

CHCI3

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Chemistry Of Carbon Compounds (Nigeria Only) (WAEC)

Wo Idahun

Ibeere 8 Ìròyìn

Which of the following does NOT contain aluminium as component?

Over-head cables

Duralumin

Container for caustic soda

Container for nitric acid

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Metals And Their Compounds (JAMB)

Metals And Their Compounds

Wo Idahun

Ibeere 9 Ìròyìn

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

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Electrolysis (JAMB)

Electrolysis

Wo Idahun

Ibeere 10 Ìròyìn

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

Nylon and soap

Nylon and artificial rubber

Soap and butane

Margarine and nylon

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Chemistry Of Carbon Compounds (Nigeria Only) (WAEC)

Ka ìwé ẹ̀kọ́ nípa Basic Biochemistry And Synthetic Polymers (WAEC)

Basic Biochemistry And Synthetic Polymers

Wo Idahun

Ibeere 11 Ìròyìn

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

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Periodic Chemistry (Ghana Only) (WAEC)

Wo Idahun

Ibeere 12 Ìròyìn

Which of these represents a redox reaction?

AgNO3 + NaCl → AgCAl + NaNO3

H2S + Pb(NO3) → PbS + 2HNO3

CaCO3 → CaO + CO2

Zn + 2HCl → ZnCl2 + H2

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Redox Reactions (WAEC)

Redox Reactions

Wo Idahun

Ibeere 13 Ìròyìn

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

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Chemistry Of Carbon Compounds (Nigeria Only) (WAEC)

Wo Idahun

Ibeere 14 Ìròyìn

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

KCI

NaNO3

K2SO4

CaSO4

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Acids, Bases And Salts (JAMB)

Acids, Bases And Salts

Wo Idahun

Ibeere 15 Ìròyìn

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

Awọn alaye Idahun

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

= 20:5

= 4:1

Ka ìwé ẹ̀kọ́ nípa Acids, Bases And Salts (JAMB)

Acids, Bases And Salts

Wo Idahun

Ibeere 16 Ìròyìn

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

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Solubility (JAMB)

Ka ìwé ẹ̀kọ́ nípa Solubility Of Substances (Ghana Only) (WAEC)

Solubility

Solubility Of Substances (Ghana Only)

Wo Idahun

Ibeere 17 Ìròyìn

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

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Kinetic Theory Of Matter And Gas Laws (JAMB)

Wo Idahun

Ibeere 18 Ìròyìn

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

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Chemical Kinetics And Equilibrium Systems (Ghana Only) (WAEC)

Chemical Kinetics And Equilibrium Systems (Ghana Only)

Wo Idahun

Ibeere 19 Ìròyìn

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-

Awọn alaye Idahun

NH4OH = 20cm of 0.1 m
NH4 + HCl → NH4Cl = H2O
Heat of Neutralization of NH4OH
= $\frac{- 102}{2}$ = -51.0 KJ mole-1

Ka ìwé ẹ̀kọ́ nípa Kinetic Theory Of Matter And Gas Laws (JAMB)

Wo Idahun

Ibeere 20 Ìròyìn

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

Awọn alaye Idahun

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

= 6.02 x 1022

Ka ìwé ẹ̀kọ́ nípa Stoichiometry And Chemical Reactions (WAEC)

Wo Idahun

Ibeere 21 Ìròyìn

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

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Chemical Combination (JAMB)

Ka ìwé ẹ̀kọ́ nípa Atomic Structure And Bonding (JAMB)

Chemical Combination

Atomic Structure And Bonding

Wo Idahun

Ibeere 22 Ìròyìn

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

excess Mg ribbon

excess cold water

very hot water

steam

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Chemical Combination (JAMB)

Chemical Combination

Wo Idahun

Ibeere 23 Ìròyìn

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

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Stoichiometry And Chemical Reactions (WAEC)

Wo Idahun

Ibeere 24 Ìròyìn

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

CnH2n2X

CnH2n + 1X

CnH2n + 2X

CnH2nX

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Periodic Chemistry (Ghana Only) (WAEC)

Ka ìwé ẹ̀kọ́ nípa Chemical Equilibra (JAMB)

Chemical Equilibra

Wo Idahun

Ibeere 25 Ìròyìn

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

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Chemical Combination (JAMB)

Chemical Combination

Wo Idahun

Ibeere 26 Ìròyìn

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

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Periodic Chemistry (Nigeria Only) (WAEC)

Periodic Chemistry (Nigeria Only)

Wo Idahun

Ibeere 27 Ìròyìn

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

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Solubility (JAMB)

Solubility

Wo Idahun

Ibeere 28 Ìròyìn

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

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Acids, Bases And Salts (JAMB)

Acids, Bases And Salts

Wo Idahun

Ibeere 29 Ìròyìn

Which of the following substances is a mixture?

granulated sugar

sea water

sodium chloride

Iron fillings

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Separation Of Mixtures And Purification Of Chemical Substances (JAMB)

Separation Of Mixtures And Purification Of Chemical Substances

Wo Idahun

Ibeere 30 Ìròyìn

Which of the following is an acidic salt?

NaHSO4

Na2SO4

CH3CO2Na

Na2S

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Acids, Bases And Salts (Ghana Only) (WAEC)

Ka ìwé ẹ̀kọ́ nípa Periodic Chemistry (Ghana Only) (WAEC)

Acids, Bases And Salts (Ghana Only)

Wo Idahun

Ibeere 31 Ìròyìn

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}}

Awọn alaye Idahun

The relationship between (U) of a gas molecule and the relative molecular mass is $\bar{U}$ = ( $\frac{k}{m}$ ) $^{\frac{1}{2}}$

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

Ka ìwé ẹ̀kọ́ nípa Kinetic Theory Of Matter And Gas Laws (JAMB)

Wo Idahun

Ibeere 32 Ìròyìn

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

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Acids, Bases And Salts (JAMB)

Acids, Bases And Salts

Wo Idahun

Ibeere 33 Ìròyìn

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

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Kinetic Theory Of Matter And Gas Laws (JAMB)

Wo Idahun

Ibeere 34 Ìròyìn

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

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Separation Of Mixtures And Purification Of Chemical Substances (JAMB)

Separation Of Mixtures And Purification Of Chemical Substances

Wo Idahun

Ibeere 35 Ìròyìn

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

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Metals And Their Compounds (JAMB)

Metals And Their Compounds

Wo Idahun

Ibeere 36 Ìròyìn

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

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Electrolysis (JAMB)

Electrolysis

Wo Idahun

Ibeere 37 Ìròyìn

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

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Acids, Bases And Salts (JAMB)

Acids, Bases And Salts

Wo Idahun

Ibeere 38 Ìròyìn

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

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Non-metals And Their Compounds (JAMB)

Non-metals And Their Compounds

Wo Idahun

Ibeere 39 Ìròyìn

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

HCl

HOCl

Cl2O

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Acids, Bases And Salts (JAMB)

Acids, Bases And Salts

Wo Idahun

Ibeere 40 Ìròyìn

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

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Stoichiometry And Chemical Reactions (WAEC)

Wo Idahun

Ibeere 41 Ìròyìn

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

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Chemistry Of Carbon Compounds (Nigeria Only) (WAEC)

Wo Idahun

Ibeere 42 Ìròyìn

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

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Stoichiometry And Chemical Reactions (WAEC)