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Consider the reaction represented by the equation: Ca(OH)2(aq) + CO 2(g) → CaCO3(s) + H 2O(l)
in the reaction above, CO 2 acts as
Aan acidic oxide
Ban oxidizing agent
Ca basic oxide
Da dehydrating agent
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Question 13
waec2007
In which of the following compound (s) will heat be absorbed on adding water?
l. KNO\(_3\) II. Concentrated H\(_2\)SO\(_4\) III. NH\(_4\)CI
AI only
Blll only
Cl and lll only
Dll and lll only
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Question 14
waec2007
Which of the following statements is true of the molecules of a gas under ideal conditions? The molecules
Amove at random
Bundergo inelastic collisions
Cattract each other
Doccupy a large volume
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Question 15
waec2007
Which of the following gases is light than air?
ACO2
BSO2
CHCI
DNH3
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Question 16
waec2007
When air is successively passed through sodium hydroxide solution, alkaline pyrogallol and then concentrated tetraoxosulphate (VI) acid, its remaining components are
Aoxygen and water vapour
Boxygen and nitrogen
Ccarbon (IV) acid and noble gases
Dnitrogen and noble gases
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Question 17
waec2007
What is the IUPAC name of the compound represented by the molecular formula NaCIO4?
ASodium tetraoxochlorate (l)
BSodium tetraoxochlorate (IV)
CSodium tetraoxochlorate (VI)
DSodium tetraoxochlorate(VII)
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Question 18
waec2007
How many atoms are there in one mole of hydrogen gas? [Avogadro's c x 1023mol-1]
A1.2 x 10 23
B6.0 x 10 23
C1.2 x10 24
D6.0 x 10 24
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Question 19
waec2007
14.8 g of a salt (z)dissolved in 250 cm3 of distilled water gives a concentration of 0.80 mol dm-3. Calculate the molar mass of the salt (z).
A13.5 g mol-1
B18.5 g mol-1
C47.4 g mol-1
D74.0 g mol-1
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Question 20
waec2007
Which of the following species does not contain a co-ordinate bond?
AAI2CI6
BCCI4
CH3O+
DNH +4
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Question 21
waec2007
Which of the following compounds has hydrogen bonds between its molecules?
AHF
BHBr
CHCI
DHI.
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Question 22
waec2007
If the difference between the electronegativities of two elements is large, the type of bond that can be formed between them is
Acovalent
Bdative
Cionic
Dmetallic
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Question 23
waec2007
Which of the following statements about sodium is not true?
ANa+ is smaller in size than Na
BNa is smaller in size than Na+
CNa+ has fewer electrons than Na
DThe effective nuclear charge in Na+ is greater than in Na
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Question 24
waec2007
Which of the following properties of atoms generally increases down a group in the periodic table?
AElectron affinity
BElectronegativity
CIonic radius
Dlonization energy
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Question 25
waec2007
A transition metal would be expected to
Afrom oxides with different formulae
Bhave strong oxidizing ability
Chave low density
Dhave an atomic structure with an incomplete outermost shell
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Question 26
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 27
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 28
waec2007
Which of the following statements about rare gases are correct?
