JAMB UTME - Chemistry - 1986 | Green Bridge CBT

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

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Stoichiometry And Chemical Reactions

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Pergunta 9 Relatório

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

Detalhes da Resposta

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Metals And Their Compounds

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Pergunta 10 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

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Acids, Bases And Salts

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Pergunta 11 Relatório

Ammonia gas is normally dried with?

concentrated sulphuric acid

quicklime

anhydrous calcium chloride

magnesium sulphate

Detalhes da Resposta

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Acids, Bases And Salts (Ghana Only)

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Pergunta 12 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

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Stoichiometry And Chemical Reactions

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Pergunta 13 Relatório

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

CH3CI

C2H5CI

CH2CI2

CHCI3

Detalhes da Resposta

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Chemistry Of Carbon Compounds (Nigeria Only)

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Pergunta 14 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

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Kinetic Theory Of Matter And Gas Laws

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Pergunta 15 Relatório

Which of these represents a redox reaction?

AgNO3 + NaCl → AgCAl + NaNO3

H2S + Pb(NO3) → PbS + 2HNO3

CaCO3 → CaO + CO2

Zn + 2HCl → ZnCl2 + H2

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Redox Reactions

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Pergunta 16 Relatório

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

Detalhes da Resposta

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Acids, Bases And Salts

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Pergunta 17 Relatório

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

Nylon and soap

Nylon and artificial rubber

Soap and butane

Margarine and nylon

Detalhes da Resposta

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Chemistry Of Carbon Compounds (Nigeria Only)

Basic Biochemistry And Synthetic Polymers

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Pergunta 18 Relatório

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

CnH2n2X

CnH2n + 1X

CnH2n + 2X

CnH2nX

Detalhes da Resposta

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Periodic Chemistry (Ghana Only)

Chemical Equilibra

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Pergunta 19 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

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Chemical Combination

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Pergunta 20 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

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Pergunta 21 Relatório

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

Detalhes da Resposta

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Periodic Chemistry (Ghana Only)

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Pergunta 22 Relatório

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

Detalhes da Resposta

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Pergunta 23 Relatório

Which of the following is an acidic salt?

NaHSO4

Na2SO4

CH3CO2Na

Na2S

Detalhes da Resposta

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Acids, Bases And Salts (Ghana Only)

Periodic Chemistry (Ghana Only)

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Pergunta 24 Relatório

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

Detalhes da Resposta

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Oxidation And Reduction

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Pergunta 25 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

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Environmental Pollution

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Pergunta 26 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

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Solubility

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Pergunta 27 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

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Electrolysis

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Pergunta 28 Relatório

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

Detalhes da Resposta

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Periodic Chemistry (Nigeria Only)

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Pergunta 29 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

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Separation Of Mixtures And Purification Of Chemical Substances

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Pergunta 30 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 $\bar{U}$ = $\sqrt{k} m$

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Pergunta 31 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

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Metals And Their Compounds

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Pergunta 32 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

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Stoichiometry And Chemical Reactions

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Pergunta 33 Relatório

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

Detalhes da Resposta

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Non-metals And Their Compounds

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Pergunta 34 Relatório

Starch can be converted to ethyl alcohol by?

distillation

fermentation

isomerization

cracking

Detalhes da Resposta

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Electrolysis

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Pergunta 35 Relatório

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

Neutralization

Saponification

Esterification

Salting-out

Detalhes da Resposta

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Acids, Bases And Salts

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Pergunta 36 Relatório

Which of the following sulphides is insoluble in dilute HCl?

Na2S

ZnS

CuS

FeS

Detalhes da Resposta

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Periodic Chemistry (Ghana Only)

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Pergunta 37 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

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Acids, Bases And Salts

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Pergunta 38 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

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Pergunta 39 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?