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Chemistry UTME / JAMB 1979 Periodic Table & Periodicity
Indicate which of the following statements is not true as we move from left to right along the periodic Table:
A
atomic number of elements increases
B
atomic mass of elements increases
C
electropositive character of elements increases
D
electronegative character of elements increases
E
number of electrons in the outermost orbits of element increases
medium Difficulty
Chemistry UTME / JAMB 1979 Electrolysis & Electrochemical Cells
0.1 Faraday of electricity was passed through a solution of copper (ll) sulphate. The maximum weight of copper deposited on the cathode would be [Cu = 64]
A
64.0g
B
32.0g
C
16.0g
D
6.4 g
E
3.2g
medium Difficulty
Chemistry UTME / JAMB 1979 Chemical Energetics & Thermochemistry
Which one of these compounds will NOT give an oxygen gas on heating?
A
Manganese dioxide
B
Hydrogen peroxide
C
Zinc nitrate
D
Sodium nitrate
E
Ammonium nitrate
medium Difficulty
Chemistry UTME / JAMB 1979 Metals, Transition Elements & Extraction
In the extraction of aluminum from purified bauxite by electrolysis, cryolite is used because
A
it makes bauxite a better conductor of electricity
B
it makes bauxite melt at a lower temperature
C
it makes aluminium purer
D
it prevents aluminium from getting oxidized
E
it protects the carbon electrodes used in the process
medium Difficulty
Chemistry UTME / JAMB 1979 Oxidation, Reduction & Redox Reactions
In the redox reaction\( 2Fe^{2+} + CI_2 → 2Fe^{3+} + 2Cl^-\)
A
Cl2 is reduced because it has lost electrons
B
Cl2 is reduced because its oxidation number has decreased
C
Cl2 is reduced because its molecule is change to two ions
D
Fe2+ is reduced because it has lost electrons
E
Fe2+ is reduced because it has gained electrons
medium Difficulty
Chemistry UTME / JAMB 1979 Acids, Bases, pH & Salts
An anhydride is?
A
a compound wich has no water of crystallization
B
an oxide whose solution in water has a PH greater than 7
C
an oxide whose solution in water has a PH less than 7
D
an oxide that has hydrogen atoms
E
an amphoteric oxide
medium Difficulty
Chemistry UTME / JAMB 1979 Oxidation, Reduction & Redox Reactions
In which of the following reactions is sulphur dioxide acting as an oxidizing agent?
A
SO 2 + 2HNO3 →H2SO4 + NO2 + Heat
B
2SO2 + 2H2O + O2→ 2H2SO4
C
SO2 + 2H2O + CI2→ H2SO4 + 2HCI
D
SO2 + 2H2S → 3S + 2H2O
E
SO2 + H2O → H2SO3
medium Difficulty
Chemistry UTME / JAMB 1979 Stoichiometry, Mole Concept & Volumetric Analysis
Calcium hydroxide and ammonium chloride when heated together will give an important product. This compound may be obtained dry by
A
dissolving it in water, recrystallizing it and then drying in the oven
B
passing it through a concentrated aqueous solution of sodium hydroxide
C
passing it through calcium oxide
D
passing it through concentrated sulphuric acid
E
passing it through anhydrous calcium choride
medium Difficulty
Chemistry UTME / JAMB 1979 Organic Chemistry II: Functional Groups, Polymers & Biomolecules
Starch can be converted to ethyl alcohol by
A
distillation
B
fermentation
C
isomerization
D
cracking
E
cooking
medium Difficulty
Chemistry UTME / JAMB 1979 Chemical Energetics & Thermochemistry
The reaction between hydrogen and iodine may be represented by the equation H2(g)+ I2(g) → 2HI(g), and is exothermic. Therefore
A
an increase in temperature favours the forword reaction
B
an increase in pressure favours the backward reaction
C
both pressure and temperature muct be increased to favour the forward reaction
D
a decrease in temperature will favour the forward reaction
E
a decrease in pressure and an increase in temperature will favour the forward reaction
medium Difficulty
Chemistry UTME / JAMB 1979 Water, Solutions & Solubility
Weighed salts Y and Z were left exposed in the laboratory overnight. In the morning Y had gained weight, and Z had become liquid. What conclusion could be drawn about the nature of the two salts?
A
Z is efflorescent
B
Y and Z are efflorescent
C
Y and Z are deliquescent
D
Y and Z are hygroscopic
E
Y is deliquescent
medium Difficulty
Chemistry UTME / JAMB 1979 Non-Metals & Their Compounds
In the manufacture of iron in the blast furnace, iron (lll) oxide is mixed with coke and limestone, and different reactions occur in the process. Which of the following statements is true with respect to these reactions?
A
the coke is a powerful reducing agent and easily converts the iron oxide to iron
B
the calcuim carbonate reacts with SiO2 an earthly impurity in the ore, to from calcuim silicate
C
the coke will react with the iron produced to form steel
D
all the carbondioxide required in the process comes from the decomposition of the calcium carbonate
E
the calcium carbonate decomposes to give calcium oxide, which then forms calcium silicate with the earthly impurity
medium Difficulty
Chemistry UTME / JAMB 1979 Kinetic Theory of Matter & Gas Laws
Which of the following statements is true?
A
an increase in the temperature of a given mass of gas increases the number of gas molecules
B
an increase in the temperature of the gas does not affect the kinetic energy
C
an increase in the pressure of the gas is proportional to the increase in volume
D
a increase in the pressure of a gas is proportional to the decrease in volume at constant temperature
E
a decrease in the pressure of the gas decreases the number of gas molecules present
medium Difficulty
Chemistry UTME / JAMB 1979 Metals, Transition Elements & Extraction
Bronze is an alloy of
A
copper, zinc and nickel
B
aluminium and copper
C
copper and zinc
D
tin and zinc
E
tin and copper
medium Difficulty
Chemistry UTME / JAMB 1979 Stoichiometry, Mole Concept & Volumetric Analysis
Phosphorus burns in oxygen according to the equation P\(_4\) + 5 0\(_2\) → P\(_4\)O\(_{10}\). How many litres of oxygen will be required at S.T.P for complete oxidation of 12.4g of phosphorus? [P = 31,O = 16 and molar volume of a gas at S.T.P = 22.4 litres]
A
5. 20
B
11. 20
C
2. 24
D
20. 20
E
6. 20
medium Difficulty
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