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Dhave an atomic structure with an incomplete outermost shell
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Question 452
waec2007
In which of the following atoms is the ionic radius larger than the atomic radius? [11 Na, 12Mg,13AI,17CI]
AAluminium
BChlorine
CMagnesium
DSodium
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Question 453
waec2007
Which of the following properties is characteristic of the halogens?
AAbility to accept electrons readily
BAbility to donate electrons readily
CAbility to from basic oxides
DFormation of coloured compounds
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Question 454
waec2007
Which of the following statements about rare gases are correct?
ATheir outermost shells are fully filled
BThey are generally unreactive
CTheir outermost shells are partially filled
DThey have lone pair of
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Question 455
waec2007
When sodium atom form the ion Na+,
Ait gains one proton
Bit achieves a noble gas configuration
Cits atomic number increases
Dit gains one electron
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Question 456
waec2006
Which of the following equations represents a substitution reaction?
AC 2H10(g) + CI 2(g) → C4H9 CI(g) + HCI(g)
BC 2H4(g) + HCI (g) → C 2H5 CI(l)
CC2H2(g) + 2H 2(g) → C 2H6(g)
DC 3H4(g) + 402(g) → 3CO2(g) + 2H 2O(g)
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Question 457
waec2006
The ammonium compound used in the manufacture of dry cells is
ANH4NO3
B(NH4)SO4
CNH4Cl
D(NH4)2CO3
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Question 458
waec2006
Which of the following substance is an ore of iron?
ABauxite
BCassiterite
CHaematite
DSteel
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Question 459
waec2006
Waste plastics accumulate in the soil and pollute the environment because plastic materials are
Ainsoluble in water
Bnon -biodegradable
Ceasily affected by heat
Dinflammab,le
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Question 460
waec2006
Greenhouse effect can be reduced by controlling
Awater evaporation
Bburning wood and fossil fuel
Cthe use of aerosols
Dthe use of artificial fertilizers
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Question 461
waec2006
What is CaHb in the following equation? C a
H b + 5O2 → 3CO 2 + 4H2O
AC 3H4
BC3H6
CC3H8
DC 5H 10
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Question 462
waec2006
Which of the following compounds is an alkanoate?
ACH3COOH
BCH3COOCH3
CCH3CH2OH
DCH3CH2COOH
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Question 463
waec2006
What type of reaction occurs between vegetable oil and plant ash extract?
ADisplacement
BDehydration
CNeutralization
DSaponiflication
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Question 464
waec2006
Which of the following industrial processes is chlorines not used?
AProduction of polyvinylchloride (PVC)
BManufacturing of hydrochloric acid
CManufacturing of common salt
DManufacturing of domestic bleach
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Question 465
waec2006
In the reaction represented by the equation. 5Fe 2+(aq) + MnO-4(aq) + 8H+(aq) → 5Fe3+(aq) + Mn2+(aq) + 4H2O(l) which species is reduced?
AFe2+
BMnO-4
CH+
DFe3+
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Question 466
waec2006
Consider the reaction: 2AI(s) + 6H+(aq) → 2AI3+(aq) + 3H2(g). What is the total number of moles of electrons transferred from the aluminium atoms to the hydrogen ions?
A3
B4
C5
D6
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Question 467
waec2006
Metals can be extracted from their ores by a process involving
Areduction
Boxidation
Chydrolysis
Ddecomposition
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Question 468
waec2006
The oxidation number of iodine in the iodate ion (IO -3) is
A-5
B-1
C+1
D+5
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Question 469
waec2006
Electrolysis is applied in the following processes except
Aelectroplating
Bextraction of aluminium
Cextraction of iron
Dpurification of copper
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Question 470
waec2006
Consider the reaction represented by the equation: 2SO\(_{2(g)}\) + O\(_{2(g)}\) ⇌ 2SO\(_{3(g)}\); ∆H = - 197 kJmol\(^{-1}\). Which of the following conditions will not increase the yield of sulphur (VI) oxide?
