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In which of the following pairs are both substances deliquescent?
ACaCI2 and H2SO4
BNaOH and MgSO4 7H2O
CCaCI2 and NaOH
DCUO and NaCI
ECaCO3 and MgCI2
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Question 714
waec1993
Which of the following compounds of tin is a strong reducing agent?
ASnCI2
BSnCI4
CSnO2
DSnH4
ESn(OH)2
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Question 715
waec1993
When the trioxonitrate (IV) salt of an alkali metal Y is heated, the formula of the residue is
AY2O
BYNO2
CY2O3
DY (NO2)2
EYO2
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Question 716
waec1993
Examples of polymers include the following except
Astarch
Bnylon
Cwool
Dperspex
Eglass
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Question 717
waec1993
Which of the following will not affect the degree of hardness in a sample of temporarily hard water?
AAddition of washing soda
BAdding of soap
CTreatment with carbon exchange resin
DFiltration
EDistillation
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Question 718
waec1993
The component of air that removed when air is bubbled into alkaline pyrogallol solution is
Acarbon(lV) oxide
Boxgyen
Cwater vapour
Dnitrogen
Ehelium
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Question 719
waec1993
Which of the following substances is a peroxide?
ANa2O2
BCuO
CPb
DFe2O
EAI2O
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Question 720
waec1993
Which of the following indicates the correct increasing order of oxidizing power of the halogens?
AF < CI < Br < l
Bl < Br < CI < F
CI < CI < Br < F
DBr < I < CI < F
ECI < F < I < Br
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Question 721
waec1993
What volume of distilled water should be added to 400cm3 of 2.0 mole dm-3 \(H_{2}SO_{4}\) to obtain 0.20 mole dm-3 of solution>
A600cm-3
B800cm-3
C1,000cm-3
D3,600cm-3
E4,000cm-3
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Question 722
waec1993
The following gases decolorize bromine water except
AC2H6
BC2H4
CC2H2
DC3H4
EC3H6
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Question 723
waec1993
Consider the reaction represented by the following equation CaCI2(aq) + H 2C2O 4(aq) ⇌ CaC 2O4(s) + 2HCI(aq). Which of the following would dissolve the precipitate of CaC 2O4 formed?
AStirring the mixture vigorously
BAdding more calcium chloride solution
Clncreasing the concentration of the ethanedioic acid
DAdding concentrated hydrochloric acid
EAdding some distilled water
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Question 724
waec1993
Some precious stones such as ruby and sapphire consist of aluminum oxide coloured by traces of the oxides of
Agroup lV elements
Bgroup l metals
Ctransition metals
Dalkaline earths
Ethe halogens
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Question 725
waec1993
Which of the following pieces of deposited if a current of 10A was passed through a solution of copper(ll) salt for 965 seconds? (1F = 96500 C)
A0.005 mole
B0.025 mole
C0.05 mole
D1.00 mole
E1.05 mole
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Question 726
waec1993
Chlorine is is used in water treatment as
Aa germicide
Ba decolorizing agent
Can antioxidant
Da coagulating agent
Ean aerating agent
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Question 727
waec1993
In which of the following changes is ∆S negative ?
AH2O(l) → H2O(s)
BC(s) + 1/2O2,/sub>(g) → CO(g)
CPCI5(g) → PCl3(g) + Cl2(g)
DNaCl(s) + aq →Na+(aq) + Cl-(aq)
ENH3(g) + HCl(g)
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Question 728
waec1993
Sulphur burns in air to form
Aan acidic oxide
Ba basic oxide
Can amphoteric oxide
Da neutra oxide
Ea mixed oxide
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Question 729
waec1993
What does X atand for in the following expression? X = Log(10)(H+)
AEnthalpy change (∆H)
BEquilibrium constant (K)
CSolubility product
DDegree of acidity (pH)
Elonic product of water
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Question 730
waec1993
Carbon is often deposited in the exhaust-pipe of cars because of the?
