JAMB UTME - Chemistry - 1986

Tazama Jibu

Swali 5 Ripoti

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

CnH2n2X

CnH2n + 1X

CnH2n + 2X

CnH2nX

Maelezo ya Majibu

Soma maelezo ya somo kwenye Periodic Chemistry (Ghana Only) (WAEC)

Soma maelezo ya somo kwenye Chemical Equilibra (JAMB)

Chemical Equilibra

Tazama Jibu

Swali 6 Ripoti

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

oxidized to ethene

polymerized to polyethene

dehydrated to ethene

dehydrated to ethyne

Maelezo ya Majibu

Tazama Jibu

Swali 7 Ripoti

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

KCI

NaNO3

K2SO4

CaSO4

Maelezo ya Majibu

Soma maelezo ya somo kwenye Acids, Bases And Salts (JAMB)

Acids, Bases And Salts

Tazama Jibu

Swali 8 Ripoti

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

Maelezo ya Majibu

Soma maelezo ya somo kwenye Non-metals And Their Compounds (JAMB)

Non-metals And Their Compounds

Tazama Jibu

Swali 9 Ripoti

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

CH3CI

C2H5CI

CH2CI2

CHCI3

Maelezo ya Majibu

Soma maelezo ya somo kwenye Chemistry Of Carbon Compounds (Nigeria Only) (WAEC)

Tazama Jibu

Swali 10 Ripoti

Which of the following is an acidic salt?

NaHSO4

Na2SO4

CH3CO2Na

Na2S

Maelezo ya Majibu

Soma maelezo ya somo kwenye Acids, Bases And Salts (Ghana Only) (WAEC)

Soma maelezo ya somo kwenye Periodic Chemistry (Ghana Only) (WAEC)

Acids, Bases And Salts (Ghana Only)

Tazama Jibu

Swali 11 Ripoti

Which of the following does NOT contain aluminium as component?

Over-head cables

Duralumin

Container for caustic soda

Container for nitric acid

Maelezo ya Majibu

Soma maelezo ya somo kwenye Metals And Their Compounds (JAMB)

Metals And Their Compounds

Tazama Jibu

Swali 12 Ripoti

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

Neutralization

Saponification

Esterification

Salting-out

Maelezo ya Majibu

Soma maelezo ya somo kwenye Acids, Bases And Salts (JAMB)

Acids, Bases And Salts

Tazama Jibu

Swali 13 Ripoti

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

Maelezo ya Majibu

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

= 6.02 x 1022

Soma maelezo ya somo kwenye Stoichiometry And Chemical Reactions (WAEC)

Tazama Jibu

Swali 14 Ripoti

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

Maelezo ya Majibu

Soma maelezo ya somo kwenye Chemical Kinetics And Equilibrium Systems (Ghana Only) (WAEC)

Chemical Kinetics And Equilibrium Systems (Ghana Only)

Tazama Jibu

Swali 15 Ripoti

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

Maelezo ya Majibu

Soma maelezo ya somo kwenye Acids, Bases And Salts (JAMB)

Acids, Bases And Salts

Tazama Jibu

Swali 16 Ripoti

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

Maelezo ya Majibu

Soma maelezo ya somo kwenye Solubility (JAMB)

Solubility

Tazama Jibu

Swali 17 Ripoti

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

none of the options is correct

Maelezo ya Majibu

Soma maelezo ya somo kwenye Metals And Their Compounds (JAMB)

Metals And Their Compounds

Tazama Jibu

Swali 18 Ripoti

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

20 cm3

25 cm3

50 cm3

100 cm3

Maelezo ya Majibu

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

Soma maelezo ya somo kwenye Separation Of Mixtures And Purification Of Chemical Substances (JAMB)

Separation Of Mixtures And Purification Of Chemical Substances

Tazama Jibu

Swali 19 Ripoti

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-

Maelezo ya Majibu

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

Soma maelezo ya somo kwenye Kinetic Theory Of Matter And Gas Laws (JAMB)

Tazama Jibu

Swali 20 Ripoti

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

Maelezo ya Majibu

Soma maelezo ya somo kwenye Chemistry Of Carbon Compounds (Nigeria Only) (WAEC)

Tazama Jibu

Swali 21 Ripoti

Which of the following substances is a mixture?

granulated sugar

sea water

sodium chloride

Iron fillings

Maelezo ya Majibu

Soma maelezo ya somo kwenye Separation Of Mixtures And Purification Of Chemical Substances (JAMB)

Separation Of Mixtures And Purification Of Chemical Substances

Tazama Jibu

Swali 22 Ripoti

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

Maelezo ya Majibu

Soma maelezo ya somo kwenye Separation Of Mixtures And Purification Of Chemical Substances (JAMB)

Separation Of Mixtures And Purification Of Chemical Substances

Tazama Jibu

Swali 23 Ripoti

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

Maelezo ya Majibu

Soma maelezo ya somo kwenye Oxidation And Reduction (JAMB)

Oxidation And Reduction

Tazama Jibu

Swali 24 Ripoti

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

Maelezo ya Majibu

Soma maelezo ya somo kwenye Kinetic Theory Of Matter And Gas Laws (JAMB)

Tazama Jibu

Swali 25 Ripoti

Starch can be converted to ethyl alcohol by?

distillation

fermentation

isomerization

cracking

Maelezo ya Majibu

Soma maelezo ya somo kwenye Electrolysis (JAMB)

Electrolysis

Tazama Jibu

Swali 26 Ripoti

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

Maelezo ya Majibu

Soma maelezo ya somo kwenye Stoichiometry And Chemical Reactions (WAEC)

Tazama Jibu

Swali 27 Ripoti

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

Maelezo ya Majibu

Soma maelezo ya somo kwenye Solubility (JAMB)

Soma maelezo ya somo kwenye Solubility Of Substances (Ghana Only) (WAEC)

Solubility

Solubility Of Substances (Ghana Only)

Tazama Jibu

Swali 28 Ripoti

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

HCl

HOCl

Cl2O

Maelezo ya Majibu

Soma maelezo ya somo kwenye Acids, Bases And Salts (JAMB)

Acids, Bases And Salts

Tazama Jibu

Swali 29 Ripoti

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

Maelezo ya Majibu

Soma maelezo ya somo kwenye Acids, Bases And Salts (JAMB)

Acids, Bases And Salts

Tazama Jibu

Swali 30 Ripoti

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

Maelezo ya Majibu

Soma maelezo ya somo kwenye Acids, Bases And Salts (JAMB)

Acids, Bases And Salts

Tazama Jibu

Swali 31 Ripoti

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

Maelezo ya Majibu

Soma maelezo ya somo kwenye Electrolysis (JAMB)

Electrolysis

Tazama Jibu

Swali 32 Ripoti

Ammonia gas is normally dried with?

concentrated sulphuric acid

quicklime

anhydrous calcium chloride

magnesium sulphate

Maelezo ya Majibu

Soma maelezo ya somo kwenye Acids, Bases And Salts (Ghana Only) (WAEC)

Acids, Bases And Salts (Ghana Only)

Tazama Jibu

Swali 33 Ripoti

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

Maelezo ya Majibu

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

= 20:5

= 4:1

Soma maelezo ya somo kwenye Acids, Bases And Salts (JAMB)

Acids, Bases And Salts

Tazama Jibu

Swali 34 Ripoti

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

Maelezo ya Majibu

Soma maelezo ya somo kwenye Kinetic Theory Of Matter And Gas Laws (JAMB)

Tazama Jibu

Swali 35 Ripoti

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

Maelezo ya Majibu

Soma maelezo ya somo kwenye Chemical Combination (JAMB)

Soma maelezo ya somo kwenye Atomic Structure And Bonding (JAMB)

Chemical Combination

Atomic Structure And Bonding

Tazama Jibu

Swali 36 Ripoti

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

Tetramethyl silane

Lead tetra-ethyl

Glycerol

n-heptane

Maelezo ya Majibu

Soma maelezo ya somo kwenye Acids, Bases And Salts (JAMB)

Acids, Bases And Salts

Tazama Jibu

Swali 37 Ripoti

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

Maelezo ya Majibu

Soma maelezo ya somo kwenye Periodic Chemistry (Ghana Only) (WAEC)

Tazama Jibu

Swali 38 Ripoti

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

Maelezo ya Majibu

Soma maelezo ya somo kwenye Stoichiometry And Chemical Reactions (WAEC)

Tazama Jibu

Swali 39 Ripoti

Which of the following sulphides is insoluble in dilute HCl?

Na2S

ZnS

CuS

FeS

Maelezo ya Majibu

Soma maelezo ya somo kwenye Periodic Chemistry (Ghana Only) (WAEC)

Tazama Jibu

Swali 40 Ripoti

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

Maelezo ya Majibu

Soma maelezo ya somo kwenye Acids, Bases And Salts (JAMB)

Acids, Bases And Salts

Tazama Jibu

Swali 41 Ripoti

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

Nylon and soap

Nylon and artificial rubber

Soap and butane

Margarine and nylon

Maelezo ya Majibu

Soma maelezo ya somo kwenye Chemistry Of Carbon Compounds (Nigeria Only) (WAEC)

Soma maelezo ya somo kwenye Basic Biochemistry And Synthetic Polymers (WAEC)

Basic Biochemistry And Synthetic Polymers

Tazama Jibu

Swali 42 Ripoti

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}}

Maelezo ya Majibu

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

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

Soma maelezo ya somo kwenye Kinetic Theory Of Matter And Gas Laws (JAMB)

Tazama Jibu

Swali 43 Ripoti

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

excess Mg ribbon

excess cold water

very hot water

steam

Maelezo ya Majibu

Soma maelezo ya somo kwenye Chemical Combination (JAMB)

Chemical Combination

Tazama Jibu

Swali 44 Ripoti

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

Maelezo ya Majibu

Soma maelezo ya somo kwenye Chemistry Of Carbon Compounds (Nigeria Only) (WAEC)