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Consider the reaction represented by the question below: KOH(aq) + HCI(aq) → KCI(aq) + H2O(l) What volume of 0.25 mol dm-3 KOH would be required to completely neutralize 40 cm3 of 0.10 mol dm -3 HCI?
A40 cm3
B32cm3
C24cm3
D16cm3
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Question 422
waec2008
Which of the following compounds would dissolved in water to give a solution whose pH is less than 7?
AAI(NO3)3
BKNO3
CN2O
DNH3
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Question 423
waec2008
An aqueous solution of CaCI2 is
Aacidic solution
Balkaline solution
Ca buffer solution
Da neutral solution
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Question 424
waec2008
The colour of phenolphthalein indicator in dilute HNO
Acolourless
Borange
Cpink
Dpurple
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Question 425
waec2008
Which of the following set of equations could be used to represent the standard enthalpy of formation of glucose?
A6C (s) + 6H 2(g) + 3O2(g) → C 6H12O6(s)
B6CO2(g) + 6H2O (l) → C6H12O6(s) + 6O 2(g)
C6C(g) + 6H 2(g) + 3O2(g) → C6H12O 6(s)
D6C(g) + 6H 2(g) + 3O2(g) → C 6H 12O 6(aq)
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Question 426
waec2008
Diamond does not conduct electricity because it?
Ahas no free valence electrons
Bis a giant molecule
Ccontains no bonded electrons
Dis a solid at room temperature
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Question 427
waec2008
The collision theory proposes that
Areactants collide more frequently to bring about reduction in the reaction rate
Ball collisions of reactants are effective
Creactants must collide with a certain minimum amount of energy to from products
Dthe fewer the collisions the faster the reaction rate
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Question 428
waec2008
When concentrated \(H_2SO_4\) is added to NaCI (s), the gas evolved
Ableaches damp blue litmus paper
Bforms a white preciptate with AgNO3(aq)
Cforms a white precipitate with BaCI2(aq)
Dturns moist red litmus paper blue
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Question 429
waec2008
In a fixed volume of a gas, an increase in temperature results in an increase in pressure due to an increase in the
Anumber of the collisions between the gas molecules and the walls of the container
Bkinetic energy of the gas
Cnumber of collisions between the gas molecules
Dnumber of repulsion between the gas molecules
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Question 430
waec2008
Which of the following gases has the lowerst rate of diffusion under the same conditions of temperature and pressure? [H = 1, O = 16, Ne = 20, CI = 35]
AChlorine
BHydrogen
CNeon
DOxygen
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Question 431
waec2008
Consider the reaction represented by the following equation: Zn(s) + 2HCI(aq) → ZnCI2(aq) + H2(g) what volume of hydrogen gas is produced at s.t.p. when 3.25 g of zinc reacts with excess dilute HCI? [Zn = 65, Molar gas volume at s.t.p. = 22.4 dm-3]
A1.12 dm3
B2.24dm3
C4.48dm3
D8.96dm3
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Question 432
waec2008
If 5.00cm3 of 0.20 mol dm-3Na2CO3 was diluted with distilled water to obtain 250 cm3 solution, what is the concentration of the resulting solution?
A0.004 mol dm-3
B0.02 mol dm-3
C0.20mol dm-3
D0.40mol dm-3
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Question 433
waec2008
Which of the following compounds with the corresponding masses contain the highest percentage of nitrogen? [N = 14]
ANH3 = 17
BNH4CI = 53.5
CNH4NO3 = 80
D(NH3)2SO4 = 132
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Question 434
waec2008
Which of the following compounds with the corresponding masses contain the highest percentage of nitrogen? [N = 14]
ANH3 = 17
BNH4CI = 53.5
CNH4NO3 = 80
D(NH3)2SO4 = 132
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Question 435
waec2008
What is the mass of 6.02 x 1024 atoms of magnesium? [Mg = 24, Avogadro c x 1023 atoms mol-1]
A240g
B24 g
C2.4g
D0.24g
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Question 436
waec2008
The force of attraction between covalent molecules is?
Aelectrostatic attraction
Bhydrogen bonding
Cionic force
Dvan der Waals forces
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Question 437
waec2008
Water molecules are held together by
Acovalent bond
Bhydrogen bond
Cionic forces
Dvan der Waals forces
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Question 438
waec2008
Arrange the following elements in order of increasing electron affinity: Br2CI2
I 2
F 2
AI 2CI2Br2F 2
BI 2Br2CI2F 2
CCI2 I 2Br2F 2
DBr2CI2 I 2 F 2
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Question 439
waec2008
Consider the following elements and their electronic configurations
W: 1s22s2
X: 1s 22s22p6
Y: 1s22s22p63s2
Z: 1s22s22p63s23p2. Which of the elements belong to the same group in the periodic table?
AW and X only
BY and Z only
CW and Y only
DW, Y and Z only
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Question 440
waec2008
Elements in the same group of the periodic table have
