Chemistry past questions: NECO SSCE 2008

42 objective questions, with answers. Free to read and practise.

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42 questions, one at a time, marked as you go or at the end. No account needed.

1.
\(^{234}_{90}Th → ^{234}_{91}Pa + X\) In the nuclear reaction above, X is
1. A.\(^0_1e\)
2. B.\(^0_{-1}e\)
3. C.\(^4_2He\)
4. D.\(^1_0n\)
5. E.\(^1_1p\)
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Answer: B \(^0_{-1}e\)
2.
A chemical system is at equilibrium when
1. A.δ G is positive
2. B.δ G is zero
3. C.δ S is negative
4. D.δ S is positive
5. E.δ S is zero
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Answer: B δ G is zero
3.
A device used in the laboratory for intermittent production of gases without heating is
1. A.aspirator
2. B.delivery tube
3. C.fume cupboard
4. D.kipp's apparatus
5. E.muller counter
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Answer: D kipp's apparatus
4.
A measure of the degree of disorderliness in a chemical system is known as the
1. A.activation energy
2. B.enthalpy
3. C.entropy
4. D.equilibrium
5. E.free energy
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Answer: C entropy
5.
A solution is prepared by dissolving I .96g of \(H_{2}\)S\(O_{4}\) in 250 c\(m^{3}\) of its solution. What is the concentration in moles per d\(m^{3}\)?
1. A.0.008
2. B.0.08
3. C.0.1
4. D.0.8
5. E.8.02
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Answer: B 0.08
6.
A substance is said to be hygroscopic when it
1. A.absorbs atmospheric moisture and then goes into solution
2. B.absorbs atmospheric moisture but does not go into solution
3. C.changes colour
4. D.is not affected by atmospheric moisture
5. E.losses its water of crystallization
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Answer: B absorbs atmospheric moisture but does not go into solution
7.
An element Z has a combining power of 3. Which of the following formulae is correct of its compound?
1. A.Z\(S _{3}\)
2. B.ZS\(O _{3}\)
3. C.ZS\(0 _{4}\)
4. D.\(Z _{2} 0 _{3}\)
5. E.\(Z _{3}\) C\(l _{2}\)
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Answer: D \(Z _{2} 0 _{3}\)
8.
Bauxite is the ore of
1. A.aluminium
2. B.calcium
3. C.Iron
4. D.sodium
5. E.magnesium
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Answer: A aluminium
9.
Brownian motion explains
1. A.Boyle's law
2. B.Collision theory
3. C.Laws of chemical combination
4. D.Molecular motion in liquids and gases
5. E.Vibrational motion in liquids
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Answer: D Molecular motion in liquids and gases
10.
Chlorine atom forms Cl- by
1. A.donating lone pair of electrons
2. B.gaining an electron
3. C.losing an electron
4. D.sharing an electron
5. E.sharing a lone pair of electrons
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Answer: B gaining an electron
11.
Chromatography is used to separate components of mixtures which differ in their rates of
1. A.diffusion
2. B.migration
3. C.reaction
4. D.sedimentation
5. E.sublimation
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Answer: B migration
12.
During the electrolysis of sodium Chloride solution, hydrogen is discharged at the carbon cathode because
1. A.hydrogen ions are in greater concentration than sodium ions.
2. B.hydrogen is higher than sodium in the electrochemical series.
3. C.hydrogen is lower than sodium in the electrochemical series.
4. D.of the nature of the electrodes.
5. E.the concentration of sodium ions is greater than that of the hydrogen ion in the electrolyte.
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Answer: C hydrogen is lower than sodium in the electrochemical series.
13.
If two elements X and Z with electronic configurations 2,8.3 and2,8,6 respectively combine, the compound formed will have the formula
1. A.XZ
2. B.X\(Z _{2}\)
3. C.\(X _{2} Z\)
4. D.\(X _{2} Z _{3}\)
5. E.\(X _{3} Z _{2}\)
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Answer: D \(X _{2} Z _{3}\)
14.
If two metallic ions of the same concentration migrate to a graphite cathode, the one that would be preferentially discharged is that with the
1. A.greater stability in solution
2. B.lower electrical charge
3. C.smaller mass
4. D.stronger tendency to accept electrons
5. E.stronger tendency to lose electrons
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Answer: D stronger tendency to accept electrons
15.
In which of the following equations can Le-chartelier's principle be applied?
1. A.\(H _{2} (g)+S(g)\) → \(H _{2} (g)\)
2. B.\(2H _{2} S(g) + O _{2} (g)\) → 2H2O(l) + 2S\(O _{2} (g)\)
3. C.\(N _{2} (g) +3H _{2} (g)\) ⇌ 2N\(H _{3} (g)\)
4. D.NaOH(aq) +C\(O _{2} (g)\) → N\(a _{2}\) C\(O _{3} (\)aq\() + H _{2} O(l)\)
5. E.\(S(s) + 0 _{2} (g)\) → S\(O _{2} (g)\)
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Answer: C \(N _{2} (g) +3H _{2} (g)\) ⇌ 2N\(H _{3} (g)\)
16.
In which of these groups will all the substances be insoluble in water?
1. A.N\(a _{2}\) C\(O _{3}\) , KN\(O _{3} ,(\)N\(H _{4} ) _{2}\) C\(0 _{3}\)
2. B.NaHC\(O _{3}\) , PbS\(O _{4}\) , CaS\(O _{4}\)
3. C.\(K _{2}\) C\(0 _{3}\) , CaS\(O _{4}\) , AgN\(O _{3}\)
4. D.PbC\(l _{2}\) , NaCl, ZnC\(l _{2}\)
5. E.ZnC\(O _{3}\) , BaS\(O _{4}\) ,AgCl
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Answer: E ZnC\(O _{3}\) , BaS\(O _{4}\) ,AgCl
17.
Matter is neither created nor destroyed in the course of any chemical reactions is a statement of the law of
1. A.combining volumes
2. B.conservation of mass
3. C.definite proportion
4. D.multiple proportion
5. E.reciprocal proportion
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Answer: B conservation of mass
18.
pH is define as
1. A.[H+]
2. B.–log [H]
3. C.–log [H+]
4. D.log [H]
5. E.log [H+]
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Answer: C –log [H+]
19.
Pipe-borne water is usually chlorinated in order to
1. A.coagulate sediments in the water
2. B.improve taste of the water
3. C.kill harmful bacteria in the water
4. D.make it pure
5. E.remove the hardness in the water
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Answer: C kill harmful bacteria in the water
20.
The action of zinc on an acid produces
1. A.chlorine
2. B.hydrogen
3. C.nitrogen
4. D.sulphur
5. E.water vapour
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Answer: B hydrogen
21.
The electrode potential in volts of 2H \(^+\) (aq) / H \(_2\) (q) system is
1. A.-2.87
2. B.-2.71
3. C.0.8
4. D.1.68
5. E.\(0\)
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Answer: E \(0\)
22.
The following acids are monobasic EXCEPT
1. A.dioxonitrate (Ill) acid
2. B.ethanedioic acid
3. C.hydrobromic acid
4. D.methanoic acid
5. E.oxochlorate (I) acid
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Answer: B ethanedioic acid
23.
The following gases are diatomic EXCEPT
1. A.Fluorine
2. B.Helium
3. C.Hydrogen
4. D.Nitrogen
5. E.Oxygen
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Answer: B Helium
24.
The gas in air used by plants for photosynthesis is
1. A.Argon
2. B.Carbon (IV) oxide
3. C.Nitrogen
4. D.Oxygen
5. E.Water vapour
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Answer: B Carbon (IV) oxide
25.
The high boiling point of hydrogen fluoride can be explained in terms of?
1. A.covalent bonds
2. B.dative bonds
3. C.dipole-dipole bonds
4. D.electrovalent (ionic) bonds
5. E.hydrogen bonds
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Answer: E hydrogen bonds
26.
The molecular formula of ethylbutanoate is?
1. A.\(C _{} H _{5}\) COO\(C _{2} 6\)
2. B.\(C _{3} H _{}\) COO\(C _{2} H _{7}\)
3. C.\(C _{3} H _{7}\) COO\(C _{3} H _{7}\)
4. D.\(C _{3} H _{7}\) COO\(C _{4} H _{9}\)
5. E.\(C _{3} H _{7}\) COO\(C _{2} H _{5}\)
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Answer: E \(C _{3} H _{7}\) COO\(C _{2} H _{5}\)
27.
The most efficient absorber of ultraviolet radiation in the atmosphere is
1. A.C\(O _{2}\)
2. B.\(H _{2}\)
3. C.\(H _{2} O\)
4. D.\(0 _{2}\)
5. E.\(O _{3}\)
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Answer: E \(O _{3}\)
28.
The planet with the highest number of moon is
1. A.Earth
2. B.Jupiter
3. C.Uranus
4. D.Pluto
5. E.Venus
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Answer: B Jupiter
29.
The rate of a chemical reaction is NOT affected by one of these factors
1. A.colour
2. B.concentration
3. C.presence of light
4. D.surface area
5. E.temperature
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Answer: A colour
30.
The reaction of hydrochloric acid and calcium trioxocarbonate (IV) produces
1. A.calcium chloride, carbon (IV) oxide and water
2. B.calcium chloride, and trioxocarbonate (IV) acid
3. C.calcium hydroxide, carbon (IV) oxide and chlorine gas
4. D.calcium hydroxide, carbon (IV) oxide and water
5. E.calcium metal and water
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Answer: A calcium chloride, carbon (IV) oxide and water
31.
The type of reaction ethyne mainly undergoes is
1. A.addition
2. B.carboxylation
3. C.esterification
4. D.saponification
5. E.substitution
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Answer: A addition
32.
What is the colour of phenolphthalein indicator in a basic medium?
1. A.Blue
2. B.Colourless
3. C.Orange
4. D.Pink
5. E.Yellow
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Answer: D Pink
33.
What is the maximum number of electrons that an f-orbital can accommodate?
1. A.2
2. B.6
3. C.7
4. D.10
5. E.14
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Answer: E 14
34.
What type of bond holds hydrogen fluoride molecules together when forming larger aggregate?
1. A.Covalent
2. B.Dative
3. C.Hydrogen
4. D.Ionic
5. E.Metallic
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Answer: C Hydrogen
35.
When dust particles collide randomly in a beam of Sunlight, the phenomenon observed is known as
1. A.Brownian movement
2. B.Dialysis
3. C.Diffusion
4. D.Osmosis
5. E.Tyndall effect
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Answer: E Tyndall effect
36.
When sodium hydroxide solution is added to a solution of zinc salt, the white precipitate formed re-dissolve in excess sodium hydroxide because
1. A.sodium hydroxide is a strong alkali
2. B.sodium is more reactive than zinc
3. C.zinc is more reactive than sodium
4. D.zinc hydroxide is amphoteric
5. E.zinc hydroxide is unstable
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Answer: D zinc hydroxide is amphoteric
37.
Which of the following compounds is unsaturated?
1. A.Cyclohexane
2. B.Methoxyethane
3. C.1 ,2-dibromoethane
4. D.2,2,3-trimethylpentane
5. E.3-methylbut-l-ene
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Answer: E 3-methylbut-l-ene
38.
Which of the following is a component of the car exhaust?
1. A.Aluminium
2. B.Calcium
3. C.Iron
4. D.Zinc
5. E.Lead
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Answer: E Lead
39.
Which of the following laws is obeyed If at constant temperature, 200cm of hydrogen at \(1.5 × 10m^{5}\)N\(m^{-2}\)pressure becomes 300c\(m^{3}\) at \(1.0 × 10^{5}\)N\(m^{-2}\) pressure?
1. A.Avogadro's
2. B.Boyle's
3. C.Charles'
4. D.Faraday's
5. E.Graham's
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Answer: B Boyle's
40.
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) → MC\(I_{2} (\)aq\() + H_{2}(g)\)
1. A.Adding some distilled water
2. B.Decreasing the temperature
3. C.Diluting the hydrochloric acid
4. D.Grinding the metal into powder
5. E.Increasing the pressure
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Answer: D Grinding the metal into powder
41.
Which of these arrangement of elements is in order of increasing ionization energy?
1. A.Boron, Carbon, Flourine, Nitrogen
2. B.Boron, Carbon, Nitrogen, Flourine
3. C.Carbon, Boron, Nitrogen, Flourine
4. D.Flourine, Nitro9en, Carbon, Boron
5. E.Nitrogen, Flourine, Carbon, Boron
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Answer: B Boron, Carbon, Nitrogen, Flourine
42.
Which of these is NOT a physical property f water?
1. A.Can be used to dissolve organic substances
2. B.Has a boiling point of 100 ° C
3. C.Has a density of 19cm3 at 40 °C
4. D.Has a freezing point of 0 ° C
5. E.is neutral to litmus
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Answer: A Can be used to dissolve organic substances

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