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Chemistry UTME / JAMB 1984 Stoichiometry, Mole Concept & Volumetric Analysis
The ratio of the number of molecules in 2g of hydrogen to that in 16g of oxygen is
A
2:1
B
1:1
C
1:2
D
1:4
E
1:8
medium Difficulty
Chemistry UTME / JAMB 1984 Stoichiometry, Mole Concept & Volumetric Analysis
The balanced equation for the reaction of tetraoxosulphate(VI)acid with aluminium hydroxide to give water and aluminium tetraoxosulphate(VI) is
A
H2SO4 + Al(OH)2 \(\to\) 2H2O + AlSO4
B
3H2SO4 + 2Al(OH)3 \(\to\) 6H2O + Al2(SO4)3
C
3H2SO4 + 2AlH \(\to\) 6H2O + Al(SO4)3
D
3H2 SO4 + 2Al(OH)3 \(\to\) Al(SO4)3
E
H2SO4 + Al(OH)3 \(\to\) H2O + Al2(SO4)3
medium Difficulty
Chemistry UTME / JAMB 1984 Acids, Bases, pH & Salts
Which of the following mixtures would result in a solution of pH greater than 7?
A
25.00 cm3 of 0.05 M H2SO4 and 25.00cm3 of 0.50 M Na2CO3
B
25.00 cm3 of 0.05 M H2SO4 and 25.00 cm3 of 0.10 M NaHCO3
C
25.00 cm3 of 0.11 MH2SO4 and 25.00cm3 0. 10 M NaOH
D
25.00cm3 of 0.11 MH2 SO4 and 50.00 cm3 of 0.05 M NaOH
E
25.00cm3 of 0.25 M H2SO4 and 50.00cm3 of 0.20 M NaOH
medium Difficulty
Chemistry UTME / JAMB 1984 Oxidation, Reduction & Redox Reactions
In which of the following reactions does hydrogen peroxide act as a reducing agent?
A
H2S + H2O2 \(\to\) S + 2H2O
B
PbSO3 + H2O2 \(\to\) PbSO4 + H2O
C
2I+ 2H+ + H2O2 \(\to\) I2 + 2H2O
D
PbO2 + 2HNO3 + H2O2 \(\to\) Pb(NO3)2 + 2H2O + O2
E
SO2 + H2O2 \(\to\) H2SO4
medium Difficulty
Chemistry UTME / JAMB 1984 Stoichiometry, Mole Concept & Volumetric Analysis
For the reaction 2Fe3+ 2I- \(\to\) 2Fe2+ + I2, which of the following statements is TRUE?
A
Fe is oxidized to Fe3+
B
Fe3+ is oxidized to Fe2+
C
I- is oxidized to I2
D
I- is reduced to I2
E
I- is displacing an electron from Fe3+
medium Difficulty
Chemistry UTME / JAMB 1984 Chemical Energetics & Thermochemistry
In dilute solution the heat of the reaction NaOH + HCl = NaCl + H2O is - 57.3kJ. Therefore the heat of the reaction 2NaOH + H2SO4 \(\to\) Na2SO4 + 2H2O is
A
+ 28.65 kJ
B
- 28.65KJ
C
+ 57.3KJ
D
- 114.6 KJ
E
- 229.2 KJ
medium Difficulty
Chemistry UTME / JAMB 1984 Non-Metals & Their Compounds
Which of the following methods may be used to prepare trioxonitrate (V) acid (nitric acid) in the laboratory?
A
Heating ammonia gas with tetraoxosulphate (VI) acid
B
Heating ammonium trioxonitrate (V) with tetraoxosulphate (VI) acid
C
Heating sodium trioxonitrate (V) with tetraoxosulphate (VI) acid
D
Heating potassium trioxonitrate (V) with calcium hydroxide
E
Heating a mixture of ammonia gas and oxygen.
medium Difficulty
Chemistry UTME / JAMB 1984 Stoichiometry, Mole Concept & Volumetric Analysis
Lime - water, which is used in the laboratory for the detection of carbon(iv)oxide is an aqueous solution of
A
Ca(OH)2
B
CaCO3
C
CaHCO3
D
CaSO4
E
N2CO3
medium Difficulty
Chemistry UTME / JAMB 1984 Non-Metals & Their Compounds
An element that can exist in two or more different structural forms which possess the same chemical properties is said to exhibit.
A
polymerism
B
isotopy
C
isomorphism
D
isomerism
E
allotrophy
medium Difficulty
Chemistry UTME / JAMB 1984 Stoichiometry, Mole Concept & Volumetric Analysis
Sulphur
A
forms two alkaline oxides
B
is spontaneously flammable
C
burns with a blue flame
D
conducts electricity in the molten state
E
is usually stored in the form of sicks in water
medium Difficulty
Chemistry UTME / JAMB 1984 Oxidation, Reduction & Redox Reactions
Which of the following statements is NOT true of carbon monoxide?
A
CO is poisonous
B
CO is readily oxidized at room temperature by air to form CO2
C
CO may be prepared by reducing CO2 mixed with coke heated to about 1000oC
D
CO may be prepared by heating charcoal with a limited amount of O2
E
CO is a good reducing agent
medium Difficulty
Chemistry UTME / JAMB 1984 Acids, Bases, pH & Salts
From the reactions : ZnO + Na2O \(\to\) NaZnO and ZnO + CO2 \(\to\) ZnCO3 it may be concluded that zinc oxide is
A
neutral
B
basic
C
acidic
D
amphoteric
E
a mixture
medium Difficulty
Chemistry UTME / JAMB 1984 Stoichiometry, Mole Concept & Volumetric Analysis
An example of a neutral oxide is
A
AL2O3
B
NO2
C
CO2
D
CO
E
SO2
medium Difficulty
Chemistry UTME / JAMB 1984 Oxidation, Reduction & Redox Reactions
3Cl2 + 2NH3 \(\to\) N2 + 6HCl. In the above reaction, ammonia acts as
A
a reducing agent
B
an oxidizing agent
C
an acid
D
a catalyst
E
a dry agent
medium Difficulty
Chemistry UTME / JAMB 1984 Oxidation, Reduction & Redox Reactions
In the Haber process for the manufacture of ammonia, finely divided iron is used as
A
an ionizing agent
B
a reducing agent
C
a catalyst
D
a dehydrating agent
E
an oxidizing agent
medium Difficulty
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