NECO SSCE - Chemistry - 2008

Tazama Jibu

Swali 3 Ripoti

A solution is prepared by dissolving I .96g of H₂SO₄ in 250 cm³ of its solution. What is the concentration in moles per dm³?

0.008

0.08

0.1

0.8

8.02

Maelezo ya Majibu

Soma maelezo ya somo kwenye Solubility (JAMB)

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

Soma maelezo ya somo kwenye Solutions (WAEC)

Solubility

Solutions

Tazama Jibu

Swali 4 Ripoti

During the electrolysis of sodium Chloride solution, hydrogen is discharged at the carbon cathode because

hydrogen ions are in greater concentration than sodium ions.

hydrogen is higher than sodium in the electrochemical series.

hydrogen is lower than sodium in the electrochemical series.

of the nature of the electrodes.

the concentration of sodium ions is greater than that of the hydrogen ion in the electrolyte.

Maelezo ya Majibu

Soma maelezo ya somo kwenye Electrolysis (JAMB)

Electrolysis

Tazama Jibu

Swali 5 Ripoti

A chemical system is at equilibrium when

δ G is positive

δ G is zero

δ S is negative

δ S is positive

δ S is zero.

Maelezo ya Majibu

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

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

Chemical Kinetics And Equilibrium Systems (Ghana Only)

Tazama Jibu

Swali 6 Ripoti

pH is define as

[H+]

–log [H]

–log [H+]

log [H]

log [H+]

Maelezo ya Majibu

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

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

Acids, Bases And Salts

Tazama Jibu

Swali 7 Ripoti

Which of the following is a component of the car exhaust?

Aluminium

Calcium

Iron

Zinc

Lead

Maelezo ya Majibu

Soma maelezo ya somo kwenye Environmental Pollution (JAMB)

Environmental Pollution

Tazama Jibu

Swali 8 Ripoti

The rate of a chemical reaction is NOT affected by one of these factors

colour

concentration

presence of light

surface area

temperature

Maelezo ya Majibu

Soma maelezo ya somo kwenye Rates Of Chemical Reaction (JAMB)

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

Rates Of Chemical Reaction

Chemical Kinetics And Equilibrium Systems (Ghana Only)

Tazama Jibu

Swali 9 Ripoti

The high boiling point of hydrogen fluoride can be explained in terms of?

covalent bonds.

dative bonds.

dipole-dipole bonds

electrovalent (ionic) bonds.

hydrogen bonds.

Maelezo ya Majibu

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

Tazama Jibu

Swali 10 Ripoti

If two elements X and Z with electronic configurations 2,8.3 and2,8,6 respectively combine, the compound formed will have the formula

XZ₂

X₂Z

X₂Z₃

X₃Z₂

Maelezo ya Majibu

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

Tazama Jibu

Swali 11 Ripoti

A device used in the laboratory for intermittent production of gases without heating is

aspirator

delivery tube

fume cupboard

kipp’s apparatus

muller counter

Maelezo ya Majibu

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

Tazama Jibu

Swali 12 Ripoti

The following gases are diatomic EXCEPT

Fluorine

Helium

Hydrogen

Nitrogen

Oxygen

Maelezo ya Majibu

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

Soma maelezo ya somo kwenye Structure Of The Atom (WAEC)

Acids, Bases And Salts (Nigeria Only)

Structure Of The Atom

Tazama Jibu

Swali 13 Ripoti

Which of the following will Increase the rate of reaction of Chips of a metal M as shown in the equation below?

M(s)+2HC1(aq) → MCI₂ (aq) + H₂(g)

Adding some distilled water

Decreasing the temperature

Diluting the hydrochloric acid

Grinding the metal into powder

Increasing the pressure

Maelezo ya Majibu

Soma maelezo ya somo kwenye Rates Of Chemical Reaction (JAMB)

Rates Of Chemical Reaction

Tazama Jibu

Swali 14 Ripoti

A substance is said to be hygroscopic when it

absorbs atmospheric moisture and then goes into solution

absorbs atmospheric moisture but does not go into solution

changes colour

is not affected by atmospheric moisture

losses its water of crystallization

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 15 Ripoti

The planet with the highest number of moon is

Earth

Jupiter

Uranus

Pluto

Venus.

Maelezo ya Majibu

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

Periodic Chemistry (Nigeria Only)

Tazama Jibu

Swali 16 Ripoti

What is the maximum number of electrons that an f-orbital can accommodate?

Maelezo ya Majibu

Soma maelezo ya somo kwenye Structure Of The Atom (WAEC)

Structure Of The Atom

Tazama Jibu

Swali 17 Ripoti

Which of the following compounds is unsaturated?

Cyclohexane

Methoxyethane

1 ,2-dibromoethane

2,2,3-trimethylpentane

3-methylbut-l-ene

Maelezo ya Majibu

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

Chemistry Of Carbon Compounds (Nigeria Only)

Tazama Jibu

Swali 18 Ripoti

In which of these groups will all the substances be insoluble in water?

Na₂CO₃, KNO₃,(NH₄)₂C0₃

NaHCO₃, PbSO₄, CaSO₄

K₂C0₃, CaSO₄, AgNO₃

PbCl₂, NaCl, ZnCl₂

ZnCO₃, BaSO₄,AgCl

Maelezo ya Majibu

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

Tazama Jibu

Swali 19 Ripoti

Chromatography is used to separate components of mixtures which differ in their rates of

diffusion

migration

reaction

sedimentation

sublimation.

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 20 Ripoti

An element Z has a combining power of 3. Which of the following formulae is correct of its compound?

ZS₃

ZSO₃

ZS0₄

Z0₃

Z₃Cl₂

Maelezo ya Majibu

Soma maelezo ya somo kwenye Chemical Combination (JAMB)

Chemical Combination

Tazama Jibu

Swali 21 Ripoti

If two metallic ions of the same concentration migrate to a graphite cathode, the one that would be preferentially discharged is that with the

greater stability in solution

lower electrical charge

smaller mass

stronger tendency to accept electrons

stronger tendency to lose electrons.

Maelezo ya Majibu

Soma maelezo ya somo kwenye Chemical Bonds (Nigeria Only) (WAEC)

Soma maelezo ya somo kwenye Structure Of The Atom (WAEC)

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

Chemical Bonds (Nigeria Only)

Structure Of The Atom

Separation Of Mixtures And Purification Of Chemical Substances

Tazama Jibu

Swali 22 Ripoti

The gas in air used by plants for photosynthesis is

Argon

Carbon (IV) oxide

Nitrogen

Oxygen

Water vapour.

Maelezo ya Majibu

Soma maelezo ya somo kwenye Air (JAMB)

Air

Tazama Jibu

Swali 23 Ripoti

Chlorine atom forms Cl- by

donating lone pair of electrons

gaining an electron

losing an electron

sharing an electron

sharing a lone pair of electrons.

Maelezo ya Majibu

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

Tazama Jibu

Swali 24 Ripoti

The electrode potential in volts of 2H+(aq) / H2(q) system is

-2.87

-2.71

0.8

1.68

\( 0 \)

Maelezo ya Majibu

Soma maelezo ya somo kwenye Oxidation And Reduction (JAMB)

Oxidation And Reduction

Tazama Jibu

Swali 25 Ripoti

When sodium hydroxide solution is added to a solution of zinc salt, the white precipitate formed re-dissolve in excess sodium hydroxide because

sodium hydroxide is a strong alkali

sodium is more reactive than zinc

zinc is more reactive than sodium

zinc hydroxide is amphoteric

zinc hydroxide is unstable

Maelezo ya Majibu

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

Tazama Jibu

Swali 26 Ripoti

The following acids are monobasic EXCEPT

dioxonitrate (Ill) acid

ethanedioic acid

hydrobromic acid

methanoic acid

oxochlorate (I) acid

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)

Periodic Chemistry (Ghana Only)

Tazama Jibu

Swali 27 Ripoti

A measure of the degree of disorderliness in a chemical system is known as the

activation energy

enthalpy

entropy

equilibrium

free energy.

Maelezo ya Majibu

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

Soma maelezo ya somo kwenye Energy Changes (JAMB)

Energy Changes

Tazama Jibu

Swali 28 Ripoti

What type of bond holds hydrogen fluoride molecules together when forming larger aggregate?

Covalent

Dative

Hydrogen

Ionic

Metallic

Maelezo ya Majibu

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

Tazama Jibu

Swali 29 Ripoti

The type of reaction ethyne mainly undergoes is

addition

carboxylation.

esterification

saponification

substitution

Maelezo ya Majibu

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

Chemistry Of Carbon Compounds (Nigeria Only)

Tazama Jibu

Swali 30 Ripoti

Matter is neither created nor destroyed in the course of any chemical reactions is a statement of the law of

combining volumes

conservation of mass

definite proportion

multiple proportion

reciprocal proportion.

Maelezo ya Majibu

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

Stoichiometry And Chemical Reactions

Tazama Jibu

Swali 31 Ripoti

\( ^{234}_{90}Th → ^{234}_{91}Pa + X \)
In the nuclear reaction above, X is

\( ^0_1e \)

\( ^0_{-1}e \)

\( ^4_2He \)

\( ^1_0n \)

\( ^1_1p\)

Maelezo ya Majibu

Soma maelezo ya somo kwenye Chemical Equilibria (JAMB)

Chemical Equilibria

Tazama Jibu

Swali 32 Ripoti

Which of these is NOT a physical property f water?

Can be used to dissolve organic substances

Has a boiling point of 100 ° C

Has a density of 19cm3 at 40 °C

Has a freezing point of 0 ° C

is neutral to litmus

Maelezo ya Majibu

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

Soma maelezo ya somo kwenye Oxidation And Reduction (JAMB)

Solubility Of Substances (Ghana Only)

Oxidation And Reduction

Tazama Jibu

Swali 33 Ripoti

The reaction of hydrochloric acid and calcium trioxocarbonate (IV) produces

calcium chloride, carbon (IV) oxide and water

calcium chloride, and trioxocarbonate (IV) acid

calcium hydroxide, carbon (IV) oxide and chlorine gas

calcium hydroxide, carbon (IV) oxide and water

calcium metal and water.

Maelezo ya Majibu

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

Acids, Bases And Salts

Tazama Jibu

Swali 34 Ripoti

Which of the following laws is obeyed If at constant temperature, 200cm of hydrogen at 1.5 × 10m⁵Nm^-2pressure becomes 300cm³ at 1.0 × 10⁵Nm^-2 pressure?

Avogadro’s

Boyle’s

Charles’

Faraday’s

Graham’s

Maelezo ya Majibu

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

Tazama Jibu

Swali 35 Ripoti

The action of zinc on an acid produces

chlorine

hydrogen

nitrogen

sulphur

water vapour.

Maelezo ya Majibu

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

Periodic Chemistry (Ghana Only)

Tazama Jibu

Swali 36 Ripoti

The most efficient absorber of ultraviolet radiation in the atmosphere is

CO₂

H₂

H₂O

0₂

O₃

Maelezo ya Majibu

Soma maelezo ya somo kwenye Air (JAMB)

Air

Tazama Jibu

Swali 37 Ripoti

Pipe-borne water is usually chlorinated in order to

coagulate sediments in the water

improve taste of the water

kill harmful bacteria in the water

make it pure

remove the hardness in the water

Maelezo ya Majibu

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

Soma maelezo ya somo kwenye Redox Reactions (WAEC)

Chemical Kinetics And Equilibrium Systems (Ghana Only)

Redox Reactions

Tazama Jibu

Swali 38 Ripoti

What is the colour of phenolphthalein indicator in a basic medium?

Blue

Colourless

Orange

Pink

Yellow

Maelezo ya Majibu

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

Tazama Jibu

Swali 39 Ripoti

Which of these arrangement of elements is in order of increasing ionization energy?

Boron, Carbon, Flourine, Nitrogen

Boron, Carbon, Nitrogen, Flourine

Carbon, Boron, Nitrogen, Flourine

Flourine, Nitro9en, Carbon, Boron

Nitrogen, Flourine, Carbon, Boron

Maelezo ya Majibu

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

Tazama Jibu

Swali 40 Ripoti

In which of the following equations can Le-chartelier’s principle be applied?

H₂(g)+S(g) → H₂(g)

2H₂S(g) + O₂ (g) → 2H2O(l) + 2SO₂(g)

N₂(g) +3H₂(g) ⇌ 2NH₃(g)

NaOH(aq) +CO₂(g) → Na₂CO₃(aq) + H₂O(l)

S(s) + 0₂(g) → SO₂(g)

Maelezo ya Majibu

Soma maelezo ya somo kwenye Chemical Equilibria (JAMB)

Chemical Equilibria

Tazama Jibu

Swali 41 Ripoti

Brownian motion explains

Boyle’s law

Collision theory

Laws of chemical combination

Molecular motion in liquids and gases

Vibrational motion in liquids.

Maelezo ya Majibu

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