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When ammonium trioxocarbonate (IV) solution is added to separate solutions of calcium, zinc and sodium salt precipitate could be formed in the case of
Acalcium only
Bzinc only
Ccalcium and znic only
Dsodium and zinc only
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Question 492
waec2004
Consider the cell represented below: Zn/Zn2+(aq) // Cu2+(aq) / Cu(s). Which of the following statements is correct about the cell
AZn is oxidized to Zn2+
BCu is oxidized to Cu2+
CIt is an electrolytic cell
Deach single line represents a salt bridge
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Question 493
waec2004
If 60 cm3 of gas is heated from 27oC TO 50oC, what is the new volume of the gas at constant pressure?
A32.4cm 3
B55.7cm3
C64.6cm3
D111.1cm3
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Question 494
waec2004
An orange drink concentrate is suspected to contain traces of poisonous green dye and a harmless dye having the same boiling point. Which of the following techniques is most suitable for isolating the dyes?
AFractional distillation
BPaper chromatography
CCoagulation
DRecrystallization
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Question 495
waec2004
Which of the following factors that affect the rate of chemical reactions can be explained in terms of the collision theory? l. concentration ll. pressure lll. temperature lV catalyst
Al and ll only
Bl, ll and lll only
Cl and lll only
Dl, II, lll and IV only
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Question 496
waec2004
WHICH OF THE FOLLOWING SALTS IS READILY SOLUBLE IN WATER?
APbCI2
BPb(NO 3) 2
CPbSO4
DPbCO 3
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Question 497
waec2004
What of the following pairs of acid and base will produce a solution with pH less than 7 at equivalence point?
AHNO3 and NaOH
BH2SO4 and KOH
CHCI and Mg(OH) 2
DHNO 3 and KOH
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Question 498
waec2004
The reaction that takes place at the cathode when an aqueous solution of NaCI is electrolysed using carbon electrodes is
A2H+2(g) + 2e- → H2(g)
BNa+2(g) + e- → Na(s)
C4OH- → 2H2O(l) + O2(g) +4e-
D2CI- → CI2(g) + 2e-
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Question 499
waec2004
Which of the following compounds is a soapless detergent?
AC 12H 25OSO3Na
BC 17H 35COONa
CC 6H5OH3
DC 4H9COOC2H 5
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Question 500
waec2004
The mass of 800cm3 of a gas X at s.t.p. is 1.0g. What is the molar mass of X? [1 mole of a gas at s.t.p occupies 22.4dm 3]
A18.0g mol-1
B22.4g mol-1
C28.0gmol-1
D36.0gmol-1
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Question 501
waec2004
What is the IUPAC name of CH3CH2COOCH 3?
AEthylethanoate
BMethylethanoate
CMethylpropanoate
DPropylmethanoate
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Question 502
waec2004
Glucose gives a brick-red precipitate with Fehling's solution because it is
Acarbohydrate
Ban alkanoate
Ca reducing sugar
Da non-electrolyte
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Question 503
waec2004
A solution of zinc chloride should not be stored in a container made of
Atin
Bcopper
Caluminium
Dlead
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Question 504
waec2004
Two solutions containing Pb2+ and AI3+ respectively can be distinguished using
ANaOH(aq)
BNH3(aq)
Cconc. HCI3
Dconc. HCI
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Question 505
waec2004
What quantity of electrons in moles is needed to discharge two moles of aluminum from aluminum oxide (AI 2O3)
A1
B2
C4
D6
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Question 506
waec2004
Which of the following subtances will not produce effervescence with dilute hydeochloric acid?
ACopper (ll) trioxocarbonate (IV)
BPotassium hydrogentrioxocarbonate (lV)
CZinc granules
DSodium chloride
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Question 507
waec2004
What are the values of x, y and z respectively in the following in the following equation? \(MnO_{2(s)} + xHCI_{(aq)} → MnCI_{2(g)} + yHO_{(l)} + zCI_{2(g)}\)
A4,1,2
B1,2,1
C2,1,2
D4,2,1
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Question 508
waec2004
What volume of hydrogen would be left over when 300cm3 of oxygen and 1000cm of hydrogen are exploded in a sealed tube? [2H2(g) + O2(g) → 2H2 Og]
A200 cm3
B400 cm3
C600cm3
D700cm3
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Question 509
waec2004
Which of the following salts is not prepared by precipitation?
ALead (ll) trioxocarbonate (lV)
BBarium trioxocarbonate (IV)
CSodium trioxocarbnate (IV)
DCalcium trioxocarbonate (IV)
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Question 510
waec2004
The alloy used extensively in the building industry is
