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Some metals are extracted from their ores after some preliminary treatments by electrolysis (L), some by thermal decomposition(T), some by a combination of both processes (TL). Which set-up in the following for the extraction of iron, copper, and aluminium is correct?
Alron (L), copper (L) aluminium (T)
Blron (T) copper (L) aluminium (T)
Clron (TL) copper (TL) aluminium (TL)
DIron (L) copper (T) aluminium (T)
Elron (T) copper (L), aluminium (TL)
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Question 12
jamb1983
Which of the following pair of gases will NOT react further with oxygen at a temperature between 30oC AND 400oC
ASO2 and NH3
BCO2 and H2
CNO2 and SO3
DSO3 and NO
ECO and H2
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Question 13
jamb1983
Which volume of 0.5 M H 2SO4 will exactly neutralize 20 cm 3 of 0.1 M NaOH solution?
A2.0 cm 3
B5.0 cm 3
C6.8 cm 3
D8.3 cm 3
E10.4 cm 3
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Question 14
jamb1983
Stainless steel is an alloy of
Acarbon, iron and lead
Bcarbon, iron and chromium
Ccarbon, iron and copper
Dcarbon, iron and silver
Ecarbon and iron only
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Question 15
jamb1983
Which of these metals, Mg, Fe, Pb and Cu will dissolve in dilute HCI?
AAll the metals
BMg ,Fe and Cu
CMg, Fe and Pb
DMg and Fe only
EMg only
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Question 16
jamb1983
In the reactions
(I) H2 (g) + 1/2O2(g) → H2O(l); ∆H = -286 KJ
(II) C(s) + O2g) → CO2 (g); ∆H = -406 KJ the equations imply that
Amore heat is absorbed in (l)
Bmore heat is absorbed in (ll)
Cless heat is evolved in (l)
Dreaction (ll) proceeds faster than (l)
Ereaction (l) proceeds faster than (ll)
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Question 17
jamb1983
Solutions X, Y, and Z have PH values 3.0. 5. 0 and 9. 0 respectively. Which of the following statements is correct?
AAll the solutions are acidic
BAll the solutions are basic
CY and Z are more acidic than water
DY is more acidic than X
EZ is the least acidic
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Question 18
jamb1983
An element is electronegative if
Ait has a tendency to exist in the gaseous from
Bits ions dissolve readily in water
Cit has a tendency to lose electrons
Dit has a tendency to gain electrons
Eit readily froms covalent bonds
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Question 19
jamb1983
Crude petroleum pollutant usually seen on some Nigerian creeks and waterways can be dispersed or removed by
Aheating the affected parts in order to boil off the petroleum
Bmechanically stirring to dissolve the petroleum in water
Cpouring organic solvents to dissolve the petroleum
Dspraying the water with detergents
Ecooling to freeze out the petroleum
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Question 20
jamb1983
Which of the following happens during the electrolysis of molten sodium chloride?
ASodium ion loses an electron
BChlorine atom gains an electron
CChlorine ion gains an electron
DSodium ion is oxidized
EChloride ion is oxidized
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Question 21
jamb1983
Sodium sulphate decahydrate (Na2SO4.10 H2O) on exposure to air loses all its water of crystallization.
The process of loss is known as
Aefflorescence
Bhygroscopy
Cdeliquescence
Deffervescence
Edehydration
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Question 22
jamb1983
A piece of burning sulphur will continue to burn in a gas jar of oxygen to give misty fumes which readily dissolved in water. The resulting liquid is
Asulphur (VI) trioxide
Btetraoxosulphate (VI) acid
Ctrioxosulphate (IV) acid
Ddioxosulphate (II) acid
Ehydrogen sulphide
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Question 23
jamb1983
How many isomeric forms are there for the molecular formula C3H6Br2?
A1
B2
C3
D4
E5
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Question 24
jamb1983
The correct name of the compound with the above structural formula is
A2-methylbut -1-ene
B2-methylbut -2-ene
C2-methylbutane
D2-ethylprop-1 -ene
E2-ethylprop-2-ene
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Question 25
jamb1983
In the reaction Fe + Cu2+ \(\to\) Fe2+ + Cu,iron displaces copper ions to from copper. This is due to the fact that
Airn is in the metallic from while the copper is in the ionic from
Bthe atomic weight of copper is greater than that of iron
Ccopper is greater than iron
Dcopper metal has more electrons than iron metal
Eiron is higher in the electrochemical series than copper
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Question 26
jamb1983
In which of the following processes is iron being oxidized?
1 Fe + H2SO4 → FeSO4 +H2
2 FeSO4 + H2S → FeS + H2SO4
3 2FeCI2 + Cl2 → 2FeCl3
4 2FeCl3 + SnCl2 + → 2FeCl2 + SnCl4
A1 only
B2 only
C3 only
D1 and 3
E2 and 4
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Question 27
jamb1983
In the reaction M + N P;∆H = + QKJ. Which of the following would increase the concentration of the product?
ADecreaseing the concentration of N
BIncreasing the concentration of P
CAdding a suitable catalyst
DDecreasing the temperature
EIncreasing the temperature
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Question 28
jamb1983
The colour imparted to a flame by calcuium ion is
Agreen
Bblue
Cbrick-red
Dyellow
Elilac
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Question 29
jamb1983
Which of the following relationships between the pressure P, the volume V and the temperature T, represents an ideal gas behaviour?
AP \(\alpha\) VT
BP \(\alpha\) T/V
CPT \(\alpha\) V
DPV \(\alpha\) I/T
EP \(\alpha\) V/T
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Question 30
jamb1983
A mixture of common salt, ammonium chloride and barium sulphate can best be separated by
Aaddition of water followed by filtration then sublimation
Baddition of water followed by sublimation then filtration
Csublimation followed by addition of water then filtration
