NECO SSCE - Chemistry - 2003 | Green Bridge CBT

Pergunta 1 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 2 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

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Pergunta 3 Relatório

What is formed when starch is completely hydrolysed?

fructose

glucose

lactose

maltose

sucrose

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Kinetic Theory Of Matter And Gas Laws

Oxidation And Reduction

Acids, Bases And Salts (Ghana Only)

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Pergunta 4 Relatório

Which is NOT a synthetic polymer?

nylon

Orion

Perspex

polystyrene

wool

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Basic Biochemistry And Synthetic Polymers

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Pergunta 5 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

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Stoichiometry And Chemical Reactions

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Pergunta 6 Relatório

What mass of silver is deposited when a current of 2.6 A is passed through a solution of a silver salt for 40 minutes? [Ag= 108 ; F=96500C]

6.89g

6.93g

6.98g

7.04g

7.12g

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Chemical Kinetics And Equilibrium System (Nigeria Only)

Electrolysis

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Pergunta 7 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

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Kinetic Theory Of Matter And Gas Laws

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Pergunta 8 Relatório

The pH of water is 7.

What is the pH of orange juice?

above 10

below 2

between 5.5 and 6.5

between 7.5 and 8.5

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Acids, Bases And Salts (Ghana Only)

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Pergunta 9 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

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Stoichiometry And Chemical Reactions

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Pergunta 10 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

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Water

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Pergunta 11 Relatório

Which separation technique is routinely applied in the petroleum industry?

chromatography

distillation

evaporation

fractional crystallization

fractional distillation

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Separation Of Mixtures And Purification Of Chemical Substances

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Pergunta 12 Relatório

A calcium atom and a calcium ion have the same

chemical properties

electric charge

electronic structure

number of electrons

number of neutrons

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Atomic Structure And Bonding

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Pergunta 13 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.

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Chemistry Of Carbon Compounds (Nigeria Only)

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Pergunta 14 Relatório

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

CH₄

C₂H₆

C₃H₆

C₃H₈

C₆H₆

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Chemistry Of Carbon Compounds (Ghana Only)

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Pergunta 15 Relatório

Which metal is a constituent of both bronze and solder?

copper

lead

silver

tin

zinc

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Metals And Their Compounds

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Pergunta 16 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.

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Chemical Kinetics And Equilibrium Systems (Ghana Only)

Structure Of The Atom

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Pergunta 17 Relatório

B is an isotope of the element \(^{238} _{92}Ur\). The isotope B has

46 protons and 119 neutrons

92 protons and 92 neutrons

92 protons and 146 neutrons

92 protons and 238 neutrons

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Atomic Structure And Bonding

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Pergunta 18 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.

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Acids, Bases And Salts

Oxidation And Reduction

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Pergunta 19 Relatório

Which method is used for the purification of copper from its ore?

distillation

electrochemical

electrolysis

neutralization

reduction

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Electrolysis

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Pergunta 20 Relatório

Which hydrocarbon does NOT exhibit structural isomerism?

C₃H₆

C₄H₆

C₄H₈

C₄H₁₀

C₅H₁₂

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Chemistry Of Carbon Compounds (Nigeria Only)

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Pergunta 21 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 22 Relatório

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

0.1

0.3

2.7

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Electrolysis

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Pergunta 23 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

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Chemistry Of Carbon Compounds (Nigeria Only)

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Pergunta 24 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?

\( \text{0} \)

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Atomic Structure And Bonding

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Pergunta 25 Relatório

Which metal bromide is widely used in photography?

calcium bromide

magnesium bromide

potassium bromide

silver bromide

sodium bromide

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Metals And Their Compounds

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Pergunta 26 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 27 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

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Kinetic Theory Of Matter And Gas Laws

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Pergunta 28 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

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Chemical Combination

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Pergunta 29 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

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Pergunta 30 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

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Kinetic Theory Of Matter And Gas Laws

Acids, Bases And Salts (Ghana Only)

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Pergunta 31 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]

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

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

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

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

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

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Kinetic Theory Of Matter And Gas Laws

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Pergunta 32 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)