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Physics UTME / JAMB 1998 Atomic, Quantum, Nuclear Physics & Electronics
In photoelectric effect, electrons will leave the metal surface when illuminated by light of appropriate frequency if the photon energy is
A
greater than the work function
B
less than the work function
C
equal to the work function
D
equal to the maximium kinetic energy of the electron
medium Difficulty
Chemistry UTME / JAMB 1998 Nature of Matter & Separation Techniques
The addition of water to calcium oxide leads to?
A
a physical change
B
a chemical change
C
the formation of a mixture
D
an endothermic change
medium Difficulty
Chemistry UTME / JAMB 1998 Organic Chemistry I: Hydrocarbons & Crude Oil
A mixture of iron and sulphur can be separated by dissolving the mixture in?
A
steam
B
dilute hydrochloric acid
C
dilute sodium hydroxide
D
benzene
medium Difficulty
Chemistry UTME / JAMB 1998 Stoichiometry, Mole Concept & Volumetric Analysis
A given amount of gas occupies 10.0 dm3 at 4atm and 273^\circC. The number of moles of the gas present is? (Molar volume of a gas at s.t.p. = 22.4 dm3)
A
0.89 mol
B
1.90 mol
C
3.80 mol
D
5.70 mol
medium Difficulty
Chemistry UTME / JAMB 1998 Stoichiometry, Mole Concept & Volumetric Analysis
8.0 g of an element X react with an excess of copper (ll) tetraoxosulphate (lV) solution to deposit 21.3 g of copper. The correct equation for the reaction is? (Cu = 64).
A
X(s) + CuSO4(aq) → Cu(s) + XSO4(aq)
B
X(s) + 2CuSO4(aq) → 2Cu(s) + X(SO4)2(aq)
C
2X(s) + CuSO4(aq) → Cu(s) + X2SO4(aq)
D
2X(s) + 3CuSO4(aq) → 3Cu(s) + X2(SO4)3(aq)
medium Difficulty
Chemistry UTME / JAMB 1998 Kinetic Theory of Matter & Gas Laws
C3H8(g) + 502(g) → 4H2O + 3CO2(g). Form the equation above the volume of oxygen at s.t.p. required to burn 50cm3 of propane is?
A
250 cm3
B
150 cm3
C
100 cm 3
D
50 cm3
medium Difficulty
Chemistry UTME / JAMB 1998 Stoichiometry, Mole Concept & Volumetric Analysis
30cm3 of hydrogen was collected over water at 27°C and 780 mm Hg. If the vapour pressure of water at the temperature of the experiment was 10 mm Hg, calculate the volume of the gas at 760 mm Hg and 7°C?
A
40.0 cm3
B
35.7 cm3
C
28.4 cm3
D
25.2 cm3
medium Difficulty
Chemistry UTME / JAMB 1998 Organic Chemistry I: Hydrocarbons & Crude Oil
If sulphur (IV) oxide and methane are released simultaneously at the opposite ends of a narrow tube, the rates of diffusion Rso2 and Rch4 will be in the ratio? (S = 32, O = 16, C = 12, H = 1)
A
4:1
B
2:1
C
1:2
D
1:4
medium Difficulty
Chemistry UTME / JAMB 1998 Periodic Table & Periodicity
Which of the following electron configurations indicates an atom with the highest ionization energy?
A
2,8,7
B
2,8,8,1
C
2,8,8,2
D
2,8,8,7
medium Difficulty
Chemistry UTME / JAMB 1998 Atomic Structure, Orbitals & Nuclear Chemistry
The line observed in the sample hydrogen spectrum are due to emission of?
A
electrons from the atoms
B
energy by proton transition
C
energy by electron transition
D
neutron from the atom
medium Difficulty
Chemistry UTME / JAMB 1998 Kinetic Theory of Matter & Gas Laws
The property used in obtaining oxygen and nitrogen industrially from air is the?
A
boiling point
B
density
C
rate of diffusion
D
solubility
medium Difficulty
Chemistry UTME / JAMB 1998 Oxidation, Reduction & Redox Reactions
Potassium tetraoxomanganate (VII) is often added to impure water to?
A
reduce organic impurities
B
reduce inorganic impurities
C
destroy bacteria and algae
D
remove permanent hardness
medium Difficulty
Chemistry UTME / JAMB 1998 Stoichiometry, Mole Concept & Volumetric Analysis
The soil around a battery manufacturing factory is likely to contain a high concentration of?
A
Ca2+ salts
B
Pb2+ salts
C
Mg2+ salts
D
Al3+ salts
medium Difficulty
Chemistry UTME / JAMB 1998 Stoichiometry, Mole Concept & Volumetric Analysis
Excess phosphorus was burnt in a gas jar and the residual gas passed successively over concentrated KOH solution and concentration H2SO4 before being collected in a flask. The gases collected are?
A
carbon (IV) oxide, nitrogen and the rare gases
B
nitrogen and the rare gases
C
carbon (IV) oxide, nitrogen (IV) oxide and the rare gases
D
carbon (IV) oxide
medium Difficulty
Chemistry UTME / JAMB 1998 Atomic Structure, Orbitals & Nuclear Chemistry
If an element X of an atomic number Z and mass number Y is irradiated by an intense concentration of neutrons, the relevant nuclear equation is?
A
yzX + 10n → y - 1z + 1X
B
yzX + 10n → y + 1zX
C
yzX + 10n → yz + 1X
D
yzX + 10n → y + 1z - 1X
medium Difficulty
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