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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 282
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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 283
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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 284
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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 285
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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 286
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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 287
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Which of the following factors would affect the equilibrium constant?
AConcentration
BTemperature
CPressure
DVolume
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Question 288
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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 289
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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 290
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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 291
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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 292
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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 293
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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 294
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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 295
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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 296
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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 297
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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 298
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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 299
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)
