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Chemistry UTME / JAMB 1982 Chemical Bonding & Intermolecular Forces
In the reaction NH3 + H+ → NH4+, the bond formed results from?
A
an electron transferred from NH3 + H+
B
an electron pair donated by NH3
C
an electron pair equally shared
D
an electron pair donated by H+
E
an electron tarnsferred from H+ to NH3
medium Difficulty
Chemistry UTME / JAMB 1982 Organic Chemistry I: Hydrocarbons & Crude Oil
Which of the following CANNOT be obtained by fractional distillation of petroleum?
A
Ether
B
Methane
C
Butane
D
Ethene
E
Hydrogen
medium Difficulty
Chemistry UTME / JAMB 1982 Stoichiometry, Mole Concept & Volumetric Analysis
In the chemical reaction A + B \(\to\) C + D, more of D is formed?
A
if the concentrated of A is reduced
B
if the concentrated of B is reduced
C
if the concentrated of C is reduced
D
if the concentration of C is increased
E
if D is continuously removed from the reaction mixture
medium Difficulty
Chemistry UTME / JAMB 1982 Stoichiometry, Mole Concept & Volumetric Analysis
1.00 g of the oxide of metal X (atomic mass = 64) gave 0.80 g of the metal when reduced with hydrogen. The formula of the oxide is?
A
X2O
B
XO
C
XO2
D
X2O3
E
X3O4
medium Difficulty
Chemistry UTME / JAMB 1982 Non-Metals & Their Compounds
When a solution of silver (l) nitrate is saturated with hydrogen sulphide, a black precipitate forms which is?
A
H2S
B
Ag2S
C
PbS
D
HNO3
E
S
medium Difficulty
Chemistry UTME / JAMB 1982 Non-Metals & Their Compounds
The production of ammonia by the haber process may be represented by the equilibrium equation N2(g) + 3H2(g) ↔ 2NH3 ∆H = -22KJ. Therefore the production of ammonia will be favoured by?
A
only high pressure
B
only high temperature
C
a combination of high temperature and low pressure
D
a combination of low temperature and high pressure
E
low pressure
medium Difficulty
Chemistry UTME / JAMB 1982 Stoichiometry, Mole Concept & Volumetric Analysis
Which of the following represents ethyl ethanonate?
A
CH3CH2CO2CH3
B
(CH3CO2)2O
C
CH3CH2CO2CH2CH3
D
CH3CO2CH2CH3
E
CH3CH2COCH2CH3
medium Difficulty
Chemistry UTME / JAMB 1982 Oxidation, Reduction & Redox Reactions
Which of the following equations represents an oxidizing action of sulphur dioxide?
A
SO2 + 2HNO2 → H2SO4 + 2NO2 + heat
B
2SO2 + 2H2O + O2 → 2H2SO4
C
SO2 + 2H2O + CI2 → H2SO4 + 2HCI
D
SO2 + 2H2S → 3S + 2H2O
E
K2Cr2O7 + H2SO4 + 3SO2 → K2SO4 + Cr2(SO4)3 + H2O
medium Difficulty
Chemistry UTME / JAMB 1982 Stoichiometry, Mole Concept & Volumetric Analysis
If the rate of diffusion of oxygen gas is taken as 1, what will be rated of diffusion of methane whose relative molar mass is 16?
A
2.0
B
1.8
C
1.4
D
1.0
E
0.5
medium Difficulty
Chemistry UTME / JAMB 1982 Stoichiometry, Mole Concept & Volumetric Analysis
If the temperature of a gas is increased?
A
the kinetic energy of the emolecules will decrease
B
the pressure will decrease if the volume is constant
C
the gas will occupy a greater volume if the pressure is constant
D
the mass of the gas will decrease
E
the pressure and volume will increase
medium Difficulty
Chemistry UTME / JAMB 1982 Stoichiometry, Mole Concept & Volumetric Analysis
When a little brine was added to a metal nitrate a white precipitate was formed which first turned violet and then black on exposure to ai. The metal nitrate is therefore?
A
sodium nitrate
B
mercuric nitrate
C
lithium nitrate
D
silver nitrate
E
potassium nitrate
medium Difficulty
Chemistry UTME / JAMB 1982 Atomic Structure, Orbitals & Nuclear Chemistry
If atom X with six electrons in its outermost shell combines with atom Y with one electron in its outermost shell to form an ionic compound, then?
A
six atoms of X will combine with one of Y
B
two atoms of X will combine with six of Y
C
one atom of X will combine with two of Y
D
two atoms of X will combine with one of Y
E
one atom of X will combine with six of Y
medium Difficulty
Chemistry UTME / JAMB 1982 Stoichiometry, Mole Concept & Volumetric Analysis
The nitrogen gas obtained by burning an excess of phosphorus in air has a density higher than the nitrogen from nitrogen compounds because the nitrogen from air is contaminated with?
A
some unburnt phosporus
B
P2O5 vapour
C
some oxygen
D
rare gases
E
carbondioxide
medium Difficulty
Chemistry UTME / JAMB 1982 Air & Environmental Chemistry
When air is passed through alkaline pyrogallol and then over quicklime, the only gases left are?
A
nitrogen and carbondoxide
B
the rare gases
C
nitrogen and oxygen
D
nitrogen and the rare gases
E
nitrogen, carbonioxide and the rare gases
medium Difficulty
Chemistry UTME / JAMB 1982 Water, Solutions & Solubility
9.8g of solid potassium chlorate (KCIO3) were added to 40 cm3 of water and heated to dissolve all the solid. As he solution cooled, crystals of potassium chlorate started forming at 60°C. The solubility of potassium chlorate at 66°C is therefore?
A
24.5 mole per dm3
B
0.2 mole per dm3
C
10.0 mole per dm3
D
20.0 mole per dm3
E
2.0 mole per dm3
medium Difficulty
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