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What is the molecular formula of a compound with empirical CH2O and vapour density of 90? [H = 1, C = 12, O = 16]
AC4H8O 2
BC4H 8O3
CC6H10C5
DC6H12O6
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Question 392
waec2009
When protein is heated to a high temperature it undergoes
Acondensation
Bdenaturation
Chydrolysis
Dpolymerization
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Question 393
waec2009
The product of the reaction between C\(_2\)H\(_5\)OH and concentrated H\(_2\)SO\(_4\) at 170\(^0\)C is
A(C2H5)2SO4
BCH 3CH 2HSO 4
C(C2H5)2O
DCH2 = CH 2
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Question 394
waec2009
Which of the following raw materials is used in the plastic industry ?
ACalcium
BEthene
CHydrogen
DMethane
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Question 395
waec2009
The separation of petroleum fractions depends on the differences in their
Aboiling points
Bmolar masses
Cmelting point
Dsolubilities
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Question 396
waec2009
Which of the following oxides of nitrogen has oxidation number of + 1?
AKNO3
BN2O
CN2O3
DNO
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Question 397
waec2009
Consider the reaction represented by the equation: 2H2SO 4(aq0 + C(s) → 2H2O(l) + 2SO2(g) + CO 2(g) H2SO 4 is acting as
Aa catalyst
Ban oxidizing agent
Ca reducing agent
Da sulphonating agent
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Question 398
waec2009
Which of the following substances is the anode in the dry Leclanche cell ?
ACarbon rod
BMuslin bag
CThe seal
DZinc container
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Question 399
waec2009
Which of the following factors will affect the rate of the reaction represented by the equation? 2HCI(aq) + CaCO 3(s) → CaCI2(aq) + H2O (I) + CO2(g) l. Pressure ll. Concentration III. Nature of reactants IV. Temperature
Al and ll only
Bll, lll and IV only
Cl, ll and lll only
Dl, ll, lll and IV
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Question 400
waec2009
A catalyst increases the rate of chemical reaction by
Adecreasing the temperature of the reaction
Bdecreasing the activation energy of the reaction
Cincreasing the surface area of the reactants
Ddecreasing the surface area of the products
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Question 401
waec2009
Which of the following statement is correct? The solubility of
Agases increases with increase in temperature
Bgases decreases with increase in temperature
Cmost solid solutes decreases with indease in temperature
Dmost solid solutes is constant
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Question 402
waec2009
Which of the following salts is insoluble in water?
APb (NO3)2
BNa 2CO3
CAgNO3
DAgCI.
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Question 403
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A solution that contains as much solute as it can dissolve at a given temperature is said to be
Aconcentrated
Bsaturated
Csupersaturated
Dunsaturated
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Question 404
waec2009
Which of the following acids from normal salt only?
ATetraoxosulphate (IV) acid
BTetraoxophosphate (V) acid
CTrioxonitrate (V) acid
DTrioxosulphate (IV) acid
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Question 405
waec2009
Which of the following hydroxides will readily dissolved in water?
ACu(OH)2
BNaOH
CPb(OH)2
DZn(OH)2
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Question 406
waec2009
Which of the following compounds is not a double salt?
AZn(OH)NO3
BKAI(SO4)2
CKCr(SO4)2
D(NH4)2Fe(SO4)2
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Question 407
waec2009
Which of the following dilute acids does not react with metals to liberate hydrogen?
ACH3COOH(aq)
BHCI(aq)
CH2SO4(aq)
DHNO3(aq)
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Question 408
waec2009
Salts that contain water of crystallization are said to be
Aanhydrous
Bdeliquescent
Cefflorescent
Dhydrated
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Question 409
waec2009
Consider the reaction represented by the following equation: H 2(g) + \(\frac{1}{2}\) O(g) → H 2O(g) ∆H =-285.8 KJmo -1 ∆H represents the enthalpy of
