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Which of the following when heated strongly in air will leave a metal as residue?
ASodium trioxonitrate (V)
BPotassium trioxonitrate (V)
CSilver trioxonitrate (V)
DLead (ll) trrioxonitrate(V)
EAluminium trioxonitrate (V)
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Question 642
waec1997
When chlorine is added to slaked lime, the product obtained is
Ableaching powder
Bchlorinated water
Chydrochloric acid
Doxochlorate (l) acid
Etrioxochlorate (V) salt
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Question 643
waec1997
Which of the substance lettered P to V in the equation below would be left on the filter paper if the reaction mixture were filtered? P (aq) + Q(aq) → V(s) + R(aq) + T(g)
AP
BQ
CV
DT
ER
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Question 644
waec1997
The use of diamond in abrasives is due ti its
Ahigh melting point
Bdurability
Clustre
Dhardness
Eoctahedral shape
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Question 645
waec1997
Which of the following is used widely in the manufacture of flavours and perfumes?
AAlkanoates
BAlkanones
CAlkanes
DComplex sugars
EAliphatic compounds
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Question 646
waec1997
Alkanes react with the halogens mainly by
Aoxidation
Bpolymerization
Caddition
Dreduction
Esubstitution
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Question 647
waec1997
The by-product of the fermentation of sugar to ethanol is
Apropane -1,2,3-triol
Bethyl ethanoate
Cethanedioc acid
Dpropanol
Ecarbon (lV) oxide
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Question 648
waec1997
Which of the following is the relative molecular mass of a compound which has empirical formula CH\(_2\)O? (H = 1; C = 12; O = 16)
A42
B45
C126
D180
E145
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Question 649
waec1997
The reaction between alkanoic acids and alkanols in the presence of a mineral acid is known as
Asaponification
Bhydrolysis
Cpolymerization
Desterification
Edehydration
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Question 650
waec1997
Ethene undergoes mainly addition reactions because it is
Aa gas
Ba hydrocarbon
Cunsaturated
Deasily polymerized
Ea covalent compound
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Question 651
waec1997
Separation of mixture of solids by physical methods can be based on differences in the following except
Amelting point
Bsolubility
Cparticle size
Dmolar mass
Emagnetic property
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Question 652
waec1997
The position of equilibrium in a reversible reaction is affected by
Aparticle size of the reactants
Bchange in concentration of the reactants
Cchange in size of the reaction vessel
Dvigorous stirring of the reaction mixture
Epresence of a catalyst
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Question 653
waec1997
How much heat will be liberated if 8g of hydrogen burns in excess oxygen according to the following equation? 2H2 + O2→ 2H2O,∆H = -571.7KJ (H = 1)
A1.42.9KJ
B571.7KJ
C1143.4KJ
D285.9KJ
E2286.8KJ
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Question 654
waec1997
If the value of ∆H for a reaction is negative, it means that the reaction is
Aslow
Bexothermic
Cspontaneous
Dirreversible
Enot feasible
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Question 655
waec1997
What is the value of x in the following equation? MnO- 4 + 4H+ + xe- → MnO 2 + 2H2O
A2
B3
C4
D7
E8
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Question 656
waec1997
From the following equations, what is the order of decreasing reactivity of X, Y and Z? Y (s) + X2+(aq) → Y2+(aq) + X(s) X(s) + Z2+(aq) → X2+(aq) + Z(s)
AX>Y>Z
BY > X > Z
CZ > Y > X
DY > Z > X
EX > Z > Y
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Question 657
waec1997
The common feature of reactions at the anode is that
Aelectrons are consumed
Boxidation is involved
Cions are reduced
Dthe electrode dissolves
Ethe electrolyte is diluted
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Question 658
waec1997
What quantity of electrons (in mole) is lost when one mole of iron (ll) ions is oxidized to iron (lll) ions?
A5 mole
B4 mole
C3 mole
D2 mole
E1 mole
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Question 659
waec1997
Which of the following ions will migrate to the cathode during electrolysis?
AZinc ions
BChloride ions
CSulphide ions
DTetraoxosulphate (Vl) ions
ETrioxonitrate (V) ions
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Question 660
waec1997
The loss of molecules of water of crystallization to the atmosphere by some crystalline salts is known as
