NECO SSCE - Chemistry - 2003 | Green Bridge CBT

Pergunta 1 Relatório

Which metal is extracted from bauxite?

aluminium

calcium

copper

magnesium

tin

Detalhes da Resposta

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Metals And Their Compounds

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Pergunta 2 Relatório

What is the concentration (in mol dm³) of a solution containing 28 g of potassium hydroxide per 100 cm³ of solution? (K=39; H=1; 0=16)

0.01

0.05

0.1

0.5

2.8

Detalhes da Resposta

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

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

Kinetic Theory Of Matter And Gas Laws

Acids, Bases And Salts (Ghana Only)

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Pergunta 3 Relatório

Small amounts of compounds of transition metals are sometimes added to glass during manufacture in order to make the glass

acquire certain colours

easier to melt

easier to mould

little brittle

more transparent

Detalhes da Resposta

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Chemical Combination

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Pergunta 4 Relatório

The boiling point of water is higher than the boiling point of ethanol because

the bonding in water is electrovalent (ionic) whereas the bonding in ethanol is convalent

the hydrogen bonding between water molecules is stronger than the hydrogen bonding between ethanol molecules

water has a higher lattice energy than ethanol.

water has hydrogen bonding between its molecules but ethanol has no hydrogen bonging between its molecules;

water is a better solvent than ethanol.

Detalhes da Resposta

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Chemical Bonds (Nigeria Only)

Energy And Energy Changes

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Pergunta 5 Relatório

The reaction C₂H₆ → C₂H + H₂ is known as

dehydration

dehydrogenation

displacement

hydrogenation

reduction

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 6 Relatório

What change will occur to the equilibrium mixture
\( 2CrO^{2-}_4(aq) + 2H^+(aq) ⇔ Cr_2O^{2-}_7(aq) + H_2O(l) \) when excess sodium hydrogen solution is added?

A yellow precipitate of Cr(OH)₃ is formed

An orange precipitate of Cr(OH)₃ is formed

The colour changes from orange to yellow

The colour changes from yellow to orange

There is no visible reaction.

Detalhes da Resposta

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

Read lesson note on Structure Of The Atom (WAEC)

Chemical Kinetics And Equilibrium Systems (Ghana Only)

Structure Of The Atom

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Pergunta 7 Relatório

An atom of element X has an electronic configuration of \( 1s^22p^33s^23p^2. \) In which group of the periodic table is X?

\( \text{0} \)

Detalhes da Resposta

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Atomic Structure And Bonding

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Pergunta 8 Relatório

Which statement is NOT true about the composition of starch?

It contains only the atoms of carbon, hydrogen oxygen

It is a polysaccharide

Its empirical formula is C₂H₂0.

It is made from the monomerC₆H₁₂O₆.

The hydrogen and oxygen atoms are in the ratio 2:1.

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 9 Relatório

How many Faradays of electricity are required to liberate 9g of aluminium? [Al = 27]

0.1

0.3

2.7

Detalhes da Resposta

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Electrolysis

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Pergunta 10 Relatório

Why does the treatment of cotton fabrics with dilute acids weaken the materials?

Cotton is hydrolysed completely to glucose

The fabrics are soluble in dilute acids

The molecular chains are partially broken

The molecular chain length f the fabric increases

The thread holding the fabric together Is completely destroyed.

Detalhes da Resposta

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

Read lesson note on Oxidation And Reduction (JAMB)

Acids, Bases And Salts

Oxidation And Reduction

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Pergunta 11 Relatório

Chlorine is used in water purification because it

bleaches impurities in the water

decolorizes water

destroys bacteria

is extremely soluble in water

is pleasant tasting

Detalhes da Resposta

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Water

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Pergunta 12 Relatório

Which metal bromide is widely used in photography?

calcium bromide

magnesium bromide

potassium bromide

silver bromide

sodium bromide

Detalhes da Resposta

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Metals And Their Compounds

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Pergunta 13 Relatório

Naturally occurring lithium consists of 90% \( ^7_3Li \text{ and 10% } ^6_3 Li. \) What is the relative atomic mass of lithium?

6.8

6.9

7.1

Detalhes da Resposta

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Read lesson note on Atomic Structure And Bonding (JAMB)

Kinetic Theory Of Matter And Gas Laws

Atomic Structure And Bonding

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Pergunta 14 Relatório

Which element is the most electronegative?

calcium

fluorine

iodine

oxygen

sodium

Detalhes da Resposta

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Atomic Structure And Bonding

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Pergunta 15 Relatório

Ethene decolourises acidified potassium tetraoxomanganate(VII) solution. Which gas will decolourise bromine water?

CH₄

C₂H₆

C₃H₆

C₃H₈

C₆H₆

Detalhes da Resposta

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

Chemistry Of Carbon Compounds (Ghana Only)

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Pergunta 16 Relatório

Which hydrocarbon does NOT exhibit structural isomerism?

C₃H₆

C₄H₆

C₄H₈

C₄H₁₀

C₅H₁₂

Detalhes da Resposta

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Chemistry Of Carbon Compounds (Nigeria Only)

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Pergunta 17 Relatório

Chlorine displaces bromine from aqueous potassium bromide because

bromine is a liquid at room temperature

bromine is weakly acidic.

bromine has a greater atomic radius than chlorine

chlorine is a stronger oxidising agent than bromine.

the density of chlorine is less than the density of bromine.

Detalhes da Resposta

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

Read lesson note on Separation Of Mixtures And Purification Of Chemical Substances (JAMB)

Kinetic Theory Of Matter And Gas Laws

Separation Of Mixtures And Purification Of Chemical Substances

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Pergunta 18 Relatório

What is the IUPAC name of CH₃CCI=C(CH₃)2?

2-chloro -3 methylbut -2yne

2 -chloro -3 methylbut -2ene

2 -chloro -3 methylbutene

3- methyl -2-chlorobut -2-ene

3- methyl -2. chlorobut -2 yne

Detalhes da Resposta

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Chemistry Of Carbon Compounds (Nigeria Only)

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Pergunta 19 Relatório

What is the change in the oxidation number of phosphorus in the following reaction?

4P(s) + 5O₂(ag) → 2P₂O₅(s)

0 to 2

0 to 5

4 to 2

4 to 5

4 to 10

Detalhes da Resposta

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Oxidation And Reduction

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Pergunta 20 Relatório

Which compound will give propane when it Is dehy drated by an excess of hot, concentrated tetraoxosvlphate(VI) acid?

CH₃CH₂CHO

CH₃CH₂CH2OH

CH₃CH₂COQH

CH₃CH₂0CH

CH₃CH₃OH

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Pergunta 21 Relatório

Which metal is a constituent of both bronze and solder?

copper

lead

silver

tin

zinc

Detalhes da Resposta

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Metals And Their Compounds

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Pergunta 22 Relatório

In the reaction 2H₂S(g) + SO₂(g) → 2H₂SO(I)+3S(s)SO₂is acting as _agent

a bleaching

a dehydrating

an oxidizing

a precipitating

a reducing

Detalhes da Resposta

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Read lesson note on Oxidation And Reduction (JAMB)

Kinetic Theory Of Matter And Gas Laws

Oxidation And Reduction

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Pergunta 23 Relatório

Which is NOT a synthetic polymer?

nylon

Orion

Perspex

polystyrene

wool

Detalhes da Resposta

Read lesson note on Basic Biochemistry And Synthetic Polymers (WAEC)

Basic Biochemistry And Synthetic Polymers

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Pergunta 24 Relatório

At s.t.p, a mole of chlorine occupies 22.4dm³. If the temperature is changed to 35°C and the pressure to 750mHg the of the new volume will be [Cl = 35.5]

\( ^{\text{760 x 22.4 x 308}} \text{750 x 273x 35.5} dm^3 \)

\( ^{\text{760 x 22.4 x 308}} \text{750 x 273}^x dm^3 \)

\( ^{\text{750 x 22.4 x 35.5}} \text{760 x 273dm3} \)

\( ^{\text{760 x 22.4 x 35.5}} \text{750x22.3x273} \)

\( ^{\text{760 x 22.4 x 35.5}} \text{750 x 308dm3} \)

Detalhes da Resposta

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Kinetic Theory Of Matter And Gas Laws

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Pergunta 25 Relatório

Why is tetraoxosulphate(VI) acid NOT used for making carbon dioxide from calcium carbonate? It is

a dehydrating agent

a strong acid

an oxidising agent

dibasic

forms insoluble calcium tetraoxosulphate(Vl)

Detalhes da Resposta

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Acids, Bases And Salts

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Pergunta 26 Relatório

An organic compound gave the following results on analysis: C = 29.3% ; H = 5.7%; Br = 65%.
What is the empirical formula of the compound? [C = 12, H = 1, Br=80]

CH₃Br

C₂H₅Br

C₃H₅Br

C₃H₇Br

C₄H₉Br

Detalhes da Resposta

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Organic Compounds

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Pergunta 27 Relatório

What is formed when starch is completely hydrolysed?

fructose

glucose

lactose

maltose

sucrose

Detalhes da Resposta

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

Read lesson note on Oxidation And Reduction (JAMB)

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

Kinetic Theory Of Matter And Gas Laws

Oxidation And Reduction

Acids, Bases And Salts (Ghana Only)

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Pergunta 28 Relatório

Which formula is used to indicate the degree of acidity of an acid?

\( [H^+] = ^{\text{mass of acid relative}} molecular mass of acid \)

F = number of H+ = ions x molar mass of the acid

Kw = [H+][OH-]

pH = - log₁₀[H+]

pKa = -log₁₀Ka

Detalhes da Resposta

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

Acids, Bases And Salts (Ghana Only)

Periodic Chemistry (Ghana Only)

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Pergunta 29 Relatório

What mass of copper is deposited when 6.5g of granulated zinc reacts with excess copper(II) tetraoxosulphate(VI) solution?

The equation for the reaction is: Zn(s) + \( CuSO_4(aq)→ ZnSO_4(aq)+ Cu(s)\)[CU= 64; Zn=65]

3.2 g

3.25 g

6.4 g

6.5 g

64.0 g

Detalhes da Resposta

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Stoichiometry And Chemical Reactions

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Pergunta 30 Relatório

The number of hydrogen ions in 1.0dm6.00x10³ of a 0.25 mole dm6.00x10^-3 tetraoxosulphate(Vl) acid solution is
[Avogadro constant = 6.0 x 1 0]

1.45x10²³

1.50 x l0²³

3.00x10²³

3.15x10²³

6.00x10²³

Detalhes da Resposta

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Stoichiometry And Chemical Reactions

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Pergunta 31 Relatório

What is the number of moles of NaHCO₃in 250cm³ of its solution if the solution contains 8.4 g of NaHCO₃ in 1 dm³ of the solution. [Na = 23, 0 = 16, C = 12, H = 1)