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Which type of reaction is illustrated by the following equation? C12H26 → 5C 2H4 + C 2H6
AAddition
BCracking
CHydrogenation
DPolymerization
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Question 682
waec2014
Which of the following compounds determines the octane rating of petrol?
A1,2,3 - trimethyl pentane
B2,3,5 - trimethyl octane
C2,3,5 - trimethyl pentane
D2,2,4 - trimethyl pentane
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Question 683
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Ethene molecules can be added to one another to form a long chain compound called a
Adimer
Bmonomer
Cpolymer
Dtrimer
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Question 684
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Reduction is the process of
Aloss of electron
Bloss of hydrogen
Closs of oxygen
Daddition of electronegative elements
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Question 685
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The reaction that occurs all the anode when CuSO4(aq) is electrolyzed using carbon electrode is
A2H -(aq) + 2e → H 2(g)
BCu2+(aq) + 2e → Cu (s)
C4OH (aq)-4e → 2H2O(l) + O2 (g)
DSO4(aq)2-2e → SO 2(g) + O2(g)
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Question 686
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Consider the reaction represented by the following equation: N2(g) + 3H2(g) ⇌ 2NH3(g); ∆Hϴ = -xkJ mol-1. Which of the following conditions would increase the yield of NH3?
AAddition of iron catalyst
BIncrease in the temperature of the system
CIncrease in the volume occupied by reactants
DIncrease in the total pressure of the system
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Question 687
waec2014
Which of the following factors would affect the equilibrium constant?
AConcentration
BTemperature
CPressure
DVolume
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Question 688
waec2014
Consider the reaction represented by the following equation: Na2CO3(aq) + 2HCl(aq) \(\longrightarrow\) 2NaCl(aq) + H2O(l) + CO2(g) . What volume of 0.02 mol dm-3 Na2CO3(aq) would be required to completely neutralize 40 cm3 of 0.10 mol dm-3 HCl(aq)?
A200 cm3
B100 cm3
C40 cm3
D20 cm3
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Question 689
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Which of the following salts on hydrolysis would give an alkaline solution?
ANH4CI(s)
BAICI3(s)
CCH3COONa(s)
DNH4NO3(s)
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Question 690
waec2014
The gases produced when Cu(NO3)2(s) was heated are
ANO and NO2
BO2 and NO
CNO2 and N2O4
DO2 and NO2
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Question 691
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Which of the following substances with the corresponding pH value is an alkali?
Substance pH
ALime 2.4
BBanana 4.6
CDistilled water 7.0
DMilk of magnesia 10.5
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Question 692
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Zinc oxide is said to be amphoteric because it
Aforms an acid salt
Bis an insoluble base
Cforms a double salt
Dreacts with a base or an acid
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Question 693
waec2014
The type of energy changes that accompany the mixing of a strong acid to a strong base is
Aelectrical
Bheat
Clight
Dsound
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Question 694
waec2014
Which of the following statements about volatile liquids is correct? They have
Ahigh vapour pressure and low boiling point
Bhigh vapour pressure and high boling point
Clow vapour pressure and low boining point
Dlow vapour pressure and high boiling point
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Question 695
waec2014
The vapour pressure of a given volume of liquid increase when the
Aliquid becomes saturated with a salt
BVolume of the liquid increases
Ctemperature of the liquid falls
Dtemperature of the Liquid rises
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Question 696
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Which of the following relationships correctly expresses the Boyle's law?
AP \(\alpha\) V at constant T
BV \(\alpha\) T at constant P
CP \(\alpha\) \(\frac{1}{V}\) at constant T
DV \(\alpha\) \(\frac{1}{T}\) at constant P
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Question 697
waec2014
Which of the following statements about a chemical system in equilibrium is correct/ The
Areaction is irreversible
Breaction goes to completion
Cequilibrium is re-established when a stress is applied
Dequilibrium position is affected by catalyst
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Question 698
waec2014
The mass of 800cm3 of gas Q at s.t.p. is 1.0g. What is the molar mass of Q? [Avogadros c mol-1`]
A18.0 gmol-1
B22,4gmol-1
C28.0gmol-1
D36.0 gmol-1
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Question 699
waec2014
If 0.20 mol dm-3 NaOH(aq) was evaporated to yield 5.0g of solid NaOH, calculate the volume of NaOH (aq) used. (Na = 23.0,O = 16:0; H = 1.00)
