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Chemistry
UTME / JAMB 1978
Metals, Transition Elements & Extraction
Solution
Which of the following reactions does not take place in the smelting of iron in a blast furnace?
A
\(CaCO_{3(s)} → CaO_{(s)} + (CO_{2(g)}\)
B
\(C_{(s)} + O_{2(g)} → CO_{2(g)}\)
C
3\(Fe{(s)} + 2O_{2(g)} → FeO_{4(s)}\)
D
\(SiO_{2(s)} + CaO_{(s)} → CaSiO_{3(s)}\)
E
\(CO_{2(g)} + C_{(s)} → 2CO_{(g)}\)
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
This reaction 3\(Fe{(s)} + 2O_{2(g)} → FeO_{4(s)}\) does not take place during the smelting of iron in a blast furnace
Source: Myschool Past Questions Archive (Record #71)
Chemistry
UTME / JAMB 1978
Organic Chemistry I: Hydrocarbons & Crude Oil
Solution
Which of the following is not a member of the homologous series of the paraffins (alkanes)?
A
C3H8
B
C5H12
C
C7H16
D
C15H32
E
C24H48
medium Difficulty
Verified Correct Answer: Option E
Chemical Principles & Mechanism
Methane. CH4.
Ethane. C2H6
Propane. C3H8
Butane. C4H10
Pentane. C5H12
Hexane. C6H14
Heptane. C7H16
Octane. C8H18
The formula for Alkanes is CnH\(_{2n+2}\)
Source: Myschool Past Questions Archive (Record #73)
Chemistry
UTME / JAMB 1978
Chemical Bonding & Intermolecular Forces
Solution
When ammonia and hydrogen ion bond together to form ammonium ion, the bond formed is called
A
ionic bond
B
electrovalent bond
C
covalent bond
D
co-ordinate bond
E
hydrogen bond
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
When one atom supplies both electrons in forming a two-electron bond, it is known as a dative covalent or coordinate bond. If two atoms contribute one electron each, it is known as a simple covalent bond. when ammonia and hydrogen ions bond together to form ammonium ion, the type of bond formed is a dative/coordinate covalent bond, because ammonia supplied both electrons with hydrogen contributing nothing.
Source: Myschool Past Questions Archive (Record #74)
Chemistry
UTME / JAMB 1978
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
An example of an alcohol is
A
CCl4
B
CH3COOH
C
CHCl3
D
C2H6
E
CH3OH
medium Difficulty
Verified Correct Answer: Option E
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option E.
Source: Myschool Past Questions Archive (Record #75)
Chemistry
UTME / JAMB 1978
Atomic Structure, Orbitals & Nuclear Chemistry
Solution
The nucleus of an atom contains
A
protons only
B
neurons only
C
protons and electrons
D
neutrons and electrons
E
protons and neutrons
medium Difficulty
Verified Correct Answer: Option E
Chemical Principles & Mechanism
The nucleus is found at the centre of the atom of an element. Inside of the nucleus, we have two subatomic particles which are protons(positively charged) and neutron (no charge). Outside of the nucleus we have the shells with the electrons revolving round it. Therefore, the nucleus of an atom contains the protons and the neutrons in it.
Source: Myschool Past Questions Archive (Record #735)
Chemistry
UTME / JAMB 1978
Acids, Bases, pH & Salts
Hypochlorous acid is used as a bleach because
A
it is a strong acid
B
it yields chlorine readily in pure water
C
it is an oxidising agent
D
it is a weak acid
E
it is a reducing agent
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option C.
Source: Myschool Past Questions Archive (Record #736)
Chemistry
UTME / JAMB 1978
Stoichiometry, Mole Concept & Volumetric Analysis
Solution
The normal boiling point of a liquid is defined as?
A
the temperature at which its vapour pressure equals the atmospheric pressure
B
the temperature at which bubbles begin to form
C
the temperature at which the vapour pressure equals 1 temperature
D
the temperature at which the rate of condensation of vapour equals the rate of vaporisation of the liquid
E
the temperature at which the space above the liquid is saturated
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
The boiling point of a substance is the temperature at which the vapor pressure of a liquid equals the pressure surrounding the liquid and the liquid changes into a vapor.
Source: Myschool Past Questions Archive (Record #737)
Chemistry
UTME / JAMB 1978
Water, Solutions & Solubility
Solution
Which of the following compounds will form a solution if exposed to air?
A
Na2CO3.10H2O
B
NaNO3
C
CuSO4
D
CaCl2
E
Na2SO4.10H2O
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
Calcium chloride is a deliquescent substance. It attracts water from the atmosphere and then forms a solution.
Source: Myschool Past Questions Archive (Record #741)
Chemistry
UTME / JAMB 1978
Organic Chemistry I: Hydrocarbons & Crude Oil
The most common type of chemical reaction which alkanes undergo is
A
substitution
B
addition
C
condensation
D
polymerisation
E
double decomposition
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option A.
Source: Myschool Past Questions Archive (Record #742)
Chemistry
UTME / JAMB 1978
Chemical Energetics & Thermochemistry
Consider the following exothermic reaction
2SO2(g) + O2(g) ↔ 2SO3(g)
If the temperature of the reaction is reduced from 800°C to 500°C, an no other change takes place, then
A
the reaction rate increases
B
concentration of SO3 decreases
C
concentration of SO3 increases
D
SO2 gas becomes unreactive
E
O3 gas becomes unreactive
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option C.
Source: Myschool Past Questions Archive (Record #743)
Chemistry
UTME / JAMB 1978
Oxidation, Reduction & Redox Reactions
Solution
If excess zinc is added to a bluish green solution of copper (II) sulphate, and the excess zinc filtered off after completion of reaction, a colourless solution is obtained because
A
both zinc and copper are metals
B
the sulphate radical and the zinc ion are divalent
C
zinc is more electropositive than copper
D
both zinc and copper form depositive ions in solution
E
zinc is a reducing agent
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
Zinc displaces copper from copper sulphate and generates zinc sulphate solution when added to CuSO\(_4\) solution because zinc is a more reactive metal that displaces less reactive metal from its solution. This implies Zinc is more electropositive than Copper. The colour change shows it.
Source: Myschool Past Questions Archive (Record #745)
Chemistry
UTME / JAMB 1978
Acids, Bases, pH & Salts
Solution
Three solutions contain carbonate, sulphate and sulphide ions respectively. One test that will identify just ONE of them completely is by addition to each of them of
A
barium chloride solution
B
dilute hydrochloric acid
C
lead nitrate solution
D
calcium chloride solution
E
sodium hydroxide solution
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
To distinguish between carbonate, sulphate, and sulphide ions, you can use dilute hydrochloric acid (HCl) and barium chloride (BaCl\(_2\)). Carbonates will react with HCl to produce a gas that turns limewater milky, sulphates react with BaCl\(_2\) to form a white precipitate, and sulphides will produce a gas with a rotten egg smell when reacted with HCl.
Silver nitrate solution is used to distinguish Cl-
When an aqueous solution of silver nitrate is added to the Cl- ion, white ppt of silver chloride is formed.
AgNO\(_3\)(aq) + Cl\(^-\)(aq) → AgCl(s) + NO\(_3\)\(^–\)(aq)
Barium chloride solution is used to distinguish SO\(_4\)\(^{2–}\) ion.
Again,when an aqueous solution of barium chloride is added to the SO\(_4\)\(^{2–}\) ion, a white ppt of barium sulphate is formed which is not soluble in weak or strong acids.
BaCl\(_2\)(aq) + SO\(_4\)\(^{2–}\)(aq) → BaSO\(_4\)(s) + 2Cl\(^-\)(aq)
Since dilute HCl can give reaction with both Carbonate ion and Sulphide ion, then it can not be the answer because the question says "one test that will identify just one of them".
Also, Pb(NO₃)₂ can distinguish between carbonate, sulphate, and sulphide solutions based on the formation of precipitates: PbCO₃ (white ppt), PbSO₄ (white ppt), and PbS (black) respectively.
Consequently, since Pb(NO₃)₂ can distinguish between carbonate, sulphate, and sulphide solutions, it implies it is the best option, and definitely our valid answer.
Source: Myschool Past Questions Archive (Record #746)
Chemistry
UTME / JAMB 1978
Organic Chemistry I: Hydrocarbons & Crude Oil
Solution
Two gas cylinders contain ethylene (ethene) and acetylene respectively. One test which can be used to distinguish between them is by?
A
passing each gas through bromine water
B
passing each gas through dilute potassium permanganate solution
C
passing each gas through silver nitrate solution
D
treating each gas catalytically with excess hydrogen gas
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
Acetylene reacts with ammoniacal AgNO3 solution to form a white precipitate of silver acetylide (AgC-=Cag) but ethylene does not
Source: Myschool Past Questions Archive (Record #756)
Chemistry
UTME / JAMB 1978
Oxidation, Reduction & Redox Reactions
Solution
Consider the following equation H2O + 2Fe2+ + Cl2 ↔ 2Fe3+ + 2Cl- + H2O. Which behaves as an oxidizing agent?
A
Fe2+
B
Cl2
C
Fe3+
D
Cl-
E
H2O
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
- An oxidizing agent is a substance that causes oxidation by accepting electrons; therefore, it gets reduced. A reducing agent is a substance that causes reduction by losing electrons; therefore it gets oxidized.
- Common examples of oxidizing agents include halogens (such as chlorine and fluorine)
Source: Myschool Past Questions Archive (Record #759)
Chemistry
UTME / JAMB 1978
Non-Metals & Their Compounds
If hydrogen sulphide gas is passed into a solution of a pure iron chloride, a yellow deposit appears. If the deposit is filtered, a pale green solution is left behind. The pale green solution is
A
dilute sulphuric acid
B
dilute hydrochloric acid
C
unreacted hydrogen sulphide in water
D
iron (III) chloride
E
Iron (II) chloride
medium Difficulty
Verified Correct Answer: Option E
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option E.
Source: Myschool Past Questions Archive (Record #761)