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Chemistry UTME / JAMB 1985 Reaction Rates & Chemical Equilibrium
In the reaction H2(g)O \(\to\) H2(g) + 1/2O2(g) \DeltaH = -2436000 KJ, which of the following has no effect on the equilibrium position?
A
Adding argon to the system
B
Lowering the temperature
C
Adding hydrogen to the system
D
Decreasing the pressure
E
Increasing the temperature
medium Difficulty
Chemistry UTME / JAMB 1985 Organic Chemistry I: Hydrocarbons & Crude Oil
Complete hydrogenation of ethyne yields?
A
benzene
B
methane
C
ethane
D
ethene
E
propane
medium Difficulty
Chemistry UTME / JAMB 1985 Non-Metals & Their Compounds
Which of the following is used in the manufacture of bleaching powder?
A
Sulphur dioxide
B
Chlorine
C
Hydrogen tetraoxosulphate (VI)
D
Hydrogen sulphide
E
Nitrogen dioxide
medium Difficulty
Chemistry UTME / JAMB 1985 Organic Chemistry II: Functional Groups, Polymers & Biomolecules
A man suspected of being drunk is made to pass his breath into acidified potassium dichlormate solution. If his breath carries a significant level of ethanol, the final colour of the solution is?
A
pink
B
purple
C
orange
D
blue-black
E
green
medium Difficulty
Chemistry UTME / JAMB 1985 Stoichiometry, Mole Concept & Volumetric Analysis
When pollen grains are suspended in water and viewed through a microscope, they appear to be in a state of constant but erratic motion. This is due to?
A
convection currents
B
small changes
C
small changes in temperature
D
a chemical reaction between the pollen grain and water
E
the bombardment of the pollen grains by molecules of water
medium Difficulty
Chemistry UTME / JAMB 1985 Chemical Energetics & Thermochemistry
The energy change (ΔH) for the reaction CO(g) + (1)/(2)O2(g) → is? (ΔHi(CO) = -110.4 kJ mol-) (ΔHi(CO2) = -393 kJ mol-)
A
-503.7 kJ
B
+503.7kJ
C
-282.9 kJ
D
+282.9 kJ
E
+393.3 kJ
medium Difficulty
Chemistry UTME / JAMB 1985 Stoichiometry, Mole Concept & Volumetric Analysis
Tetraoxosulphate (IV) ions are finally tested using?
A
acidified silver nitrate
B
acidified barium chloride
C
lime-water
D
dilute hydrochloric acid
E
acidified lead nitrate
medium Difficulty
Chemistry UTME / JAMB 1985 Organic Chemistry I: Hydrocarbons & Crude Oil
An organic compound decolourized acidified KMnO4 solution but failed to react with ammoniacal silver nitrate solution. The organic compound is likely to be?
A
a carbonxylic acid
B
an alkane
C
an alkene
D
an alkyne
E
an akanone
medium Difficulty
Chemistry UTME / JAMB 1985 Stoichiometry, Mole Concept & Volumetric Analysis
Solid sodium hydroxide on exposure to air absorbs a gas and ultimately gives another alkaline substance with the molecular formula?
A
NaOH.H2O
B
NaOH.N2
C
Na\(_2\)CO\(_3\)
D
NaHCO3
E
NaNO3
medium Difficulty
Chemistry UTME / JAMB 1985 Stoichiometry, Mole Concept & Volumetric Analysis
Which of the following substances is the most abundant in the universe?
A
Carbon
B
Air
C
Water
D
Oxygen
E
Hydrogen
medium Difficulty
Chemistry UTME / JAMB 1985 Stoichiometry, Mole Concept & Volumetric Analysis
A colourless organic compound X was burnt in excess air to give two colourless and odourless gases, Y and Z, as products. X does not decolorize blue bromine vapour, Y turns lime milky while Z gives a blue colour with copper (ll) tetraoxosulphate (IV). Y and Z are respectively?
A
CO2 and NH3
B
CO and NH3
C
SO2 and H2O
D
CO2 and H2O
E
SO2 and NH3
medium Difficulty
Chemistry UTME / JAMB 1985 Stoichiometry, Mole Concept & Volumetric Analysis
Which of the following compounds is NOT the correct product formed when the parent metals is heated in air?
A
Calcium oxide (CaO)
B
Sodium oxide (Na2O)
C
Copper (ll) oxide (CuO)
D
Tri-iron tetroxide (Fe3O4)
E
Aluminium oxide (Al2O3)
medium Difficulty
Chemistry UTME / JAMB 1985 Atomic Structure, Orbitals & Nuclear Chemistry
The atomic number of an element whose cation, X2+, has the ground state electronic configuration 1s22s22p63s22p6 is?
A
16
B
18
C
20
D
22
E
24
medium Difficulty
Chemistry UTME / JAMB 1985 Stoichiometry, Mole Concept & Volumetric Analysis
When marble is heated to about 1473 K, another white solid is obtained which reacts vigorously with water to give an alkaline solution. The solution contains?
A
NaOH
B
KOH
C
Mg(OH)2
D
Zn(OH)2
E
Ca(OH)2
medium Difficulty
Chemistry UTME / JAMB 1985 Oxidation, Reduction & Redox Reactions
Addition of dilute hydrochloride acid to an aqueous solution of a crystalline salt yield a yellow precipitate and a gas which turned dichromate paper green. The crystalline salt was probably?
A
Na2SO4
B
Na2S
C
Na2S2O3.5H2O
D
Na2CO3
E
NaHCO3
medium Difficulty
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