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Which of the these metals will not liberate hydrogen from dilute HCI?
ACopper
BIron
CMagnesium
DZinc
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Question 2
waec2007
What volume will 0.5 g of H2 occupy at s.t.p? [H = 1; 1 mole of a gas occupy 22.4 dm3 at s.t.p.]
A2.24 dm3
B5.60dm3
C11.20dm3
D44.80dm3
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Question 3
waec2007
Pig-iron is brittle because it contains
Aa high percentage of carbon as impurity
Bcalcium trioxosilicate (IV)
Cunreacted haematite
Dundecomposed limestone
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Question 4
waec2007
The following substances are heavy chemicals except
Asodium trioxocarbonate (IV)
Btetraoxosulphate (VI) acid
Clead (lV) tetraethyl
Dsodium hydroxide
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Question 5
waec2007
Which of the following methods can be used to separate a mixture of two miscible liquids with different boiling points?
ADecantation
BDistillation
CEvaporation
DFiltration
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Question 6
waec2007
from the following ores is iron extracted? I. Haematite ll. Bauxite III. Magnetite IV. Cassiterite
Al and ll only
Bl and lll only
Cl, ll and lll only
Dl, ll, lll and lV
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Question 7
waec2007
Glucose reduces Fehling's solution on warming to
Acopper (l) oxide
Bcopper (ll) oxide
Ccopper (l) chloride
Dcopper (ll) hydroxide
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Question 8
waec2007
Which of the following compounds reacts readily with sodium to liberate hydrogen?
ACH3CH2CH3
BCH3COOH
CCH3 CH2CHO
DCH3 CH(OH)CH3
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Question 9
waec2007
Consider the reaction below: Vegetable oil \(\frac{H2;NI catalyst}{High temperature}\) product. The reaction is applied in the manufacture of?
Adrugs
Bmargarine
Cparaffin wax
Dsoapy detergents
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Question 10
waec2007
Hydrocarbons which react with ammoniacal copper (l) chloride solution conform to the general molecular formula
ACnH2n
BCnH2n
CCnH2n+2
DCnH2n-2
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Question 11
waec2007
Alkenes undergo the following reactions except
Aaddition
Bhydration
Cpolymerization
Dsubstitution
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Question 12
waec2007
Which of the following pairs of substances can be distinguished by use of NaHCO3 solution?
ACH 3CH2OH and HCOOCH3
BCH 3CH2OH and CH3COOH
CCH3COOH and HCOOH
DCH 3CH2OH and CH3OH
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Question 13
waec2007
The complete hydrogenation of C 6
H 6 in the presence of nicked catalyst at 200oC gives
AC6H8
BC 6H10
CC 6H 12
DC 6H 14
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Question 14
waec2007
Which of the following substances is suitable solvent for perfumes?
ABenzene
BEthanol
CTurpentine
DWater
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Question 15
waec2007
What product is formed at the cathode during the electrolysis of concentrated sodium chloride solution using carbon electrodes?
AChlorine
BHydrogen
COxygen
DSodium
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Question 16
waec2007
What is the oxidation number of chromium in K2CrO4?
A+1
B+2
C+4
D+6
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Question 17
waec2007
Which of these cell notations is the correct representation of a Daniell cell?
AZn(s) / Zn2+(aq) // Cu2+(aq)/Cu(s)
BCu(s) / CU2+(aq) // Zn2+(aq) / Zn(s)
CZn2+(aq) / Zn(s) // Cu2+(aq) /Cu(s)
DCu2+(aq) / Cu(s) // Zn(s) / Zn2+(aq)
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Question 18
waec2007
Consider the reaction represented by the following equation: N2(g) + 3H2(g) ⇌ 2NH3(g); ∆H = - 92kJmol1. Finely divided iron is used as catalyst in the reaction in order to
Alower the value of ∆H
Bincrease the time for attainment of equilibrium
Cshorten the time for attainment of equilibrium
Ddecrease the yield of ammonia
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Question 19
waec2007
A solution of a salt X reacts with AgNO3 solution to give white precipitate which dissolves in excess aqueous ammonia. X contains
ACI-
BPb 2+
CSO 2-
DZn2+
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Question 20
waec2007
What process is illustrated below? S(s) ⇌H2O⇌ S (aq)
