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Chemistry
UTME / JAMB 1994
Acids, Bases, pH & Salts
Solution
An anhydride is an oxide of non-mental
A
which will not dissolve in water
B
whose solution in water has a pH greater than 7
C
whose solution in water has a pH less than 7
D
whose solution in water has a pH of 7
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
Acid anhydrides are the molecules that are capable of forming acidic solutions in water. The meaning of anhydride is the removal of water. Hence their pH will be less than 7.
Source: Myschool Past Questions Archive (Record #13551)
Chemistry
UTME / JAMB 1994
Oxidation, Reduction & Redox Reactions
MnO4(aq) + 8H + (aq) + 5Fe2+ → Mn2+(aq) + 4H2O(I). The oxidation number of manganese in the above reaction changed from?
A
+7 to +2
B
+6 to +2
C
+5 to +2
D
+4 to +2
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 #13554)
Chemistry
UTME / JAMB 1994
Reaction Rates & Chemical Equilibrium
Which of the following is TRUE of Le Chatelier's Principle for an exothermic reaction?
A
Increase in temperature will cause an increase in the equilibrium constant
B
Increase in temperature will cause a decrease in the equilibrium constant
C
Addition of a catalyst will cause an increase in the equilibrium constant
D
Addition of a catalyst will cause a decrease in the equilibrium constant
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option B.
Source: Myschool Past Questions Archive (Record #13555)
Chemistry
UTME / JAMB 1994
Non-Metals & Their Compounds
Which of the following are produced when ammonium trioxonitrate (V) crystals are cautiously heated in a hard glass round bottomed flask?
A
N2O and steam
B
NO2 and ammonia
C
N2O2 and NO2
D
NO and NO2
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 #13557)
Chemistry
UTME / JAMB 1994
Stoichiometry, Mole Concept & Volumetric Analysis
Which of these metals CANNOT replace hydrogen from alkaline solutions?
A
Alulinium
B
Zinc
C
Tin
D
Iron
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option D.
Source: Myschool Past Questions Archive (Record #13559)
Chemistry
UTME / JAMB 1994
Stoichiometry, Mole Concept & Volumetric Analysis
Clothes should be properly rinsed with water after bleaching because?
A
the bleach decolourizes the cothes
B
chlorine reacts with fabrics during bleaching
C
the clothes are sterilized during bleaching
D
hydrogen chloride solution is produced during bleaching
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option D.
Source: Myschool Past Questions Archive (Record #13561)
Chemistry
UTME / JAMB 1994
Stoichiometry, Mole Concept & Volumetric Analysis
Solution
Which of these solutions will give a white precipitate with a solution of barium chloride acidified with hydrochloric acid?
A
Sodium trioxocarbonate (IV)
B
Sodium tetraoxosulphate (IV)
C
Sodium trioxosulphate (IV)
D
Sodium sulphide
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
The characteristic test for any soluble tetraoxosulphate(VI) is the formation of white precipitate (barium sulphate) when a solution of barium chloride, acidified with dilute HCl, or when a solution of barium nitrate, acidified with dilute nitric acid is reacted with it.
Source: Myschool Past Questions Archive (Record #13563)
Chemistry
UTME / JAMB 1994
Non-Metals & Their Compounds
SO3 is NOT directly dissolved in water in the preparation of H2SO4 by the contact process because?
A
the reaction between SO3 and water is violently exothermic
B
acid is usually added to water and never water to acid
C
SO3 does not dissolve in water readily
D
SO3 is an acid gas
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 #13589)
Chemistry
UTME / JAMB 1994
Stoichiometry, Mole Concept & Volumetric Analysis
Which of the following is NOT true of metals?
A
They are good conductors of electricity
B
They ionize by electron loss
C
Their oxides are acidic
D
They have high melting points
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 #13592)
Chemistry
UTME / JAMB 1994
Organic Chemistry I: Hydrocarbons & Crude Oil
Solution
Which of the following compounds is NOT an isomers of 2,2 dimethylbutane?
A
2-methylbutane
B
3-methylpentane
C
2,3-dimethylbutane
D
2-methylpentane
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
2,2-Dimethylbutane has the molecular formula \(C_8H_{18}\). The options provided include various compounds, but 2-methylbutane has the formula \(C_5H_{12}\), meaning it has fewer carbon atoms and is not an isomer of 2,2-dimethylbutane
Source: Myschool Past Questions Archive (Record #13595)
Chemistry
UTME / JAMB 1994
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
When sodium is added to ethanol, the products are?
A
sodium hydroxide and water
B
sodium hydroxide and hydrogen
C
sodium ethoxide and water
D
sodium ethoxide and hydrogen
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option D.
Source: Myschool Past Questions Archive (Record #13596)
Chemistry
UTME / JAMB 1994
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
Solution
The general formula of alkanoates is?
A
RCHO
B
R2CO
C
RCOOH
D
RCOOR
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
Otherwise known as ESTERS, they are easily gotten from a reaction between the CARBOXYLIC acids and ALCOHOLS
RCOOH + R'OH yields a combination of an ester(RCOOR') and water.
Source: Myschool Past Questions Archive (Record #13597)
Chemistry
UTME / JAMB 1994
Organic Chemistry I: Hydrocarbons & Crude Oil
One mole of a hydrocarbon contains 48 g of carbon. If it vapour density is 28, the hydrocarbon is?
A
an alkane
B
an alkene
C
an alkyne
D
aromatic (C = 12, H = 1)
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option B.
Source: Myschool Past Questions Archive (Record #13599)
Chemistry
UTME / JAMB 1994
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
Which of the following reagents will confirm the presence of unsaturation in a compound?
A
Fehling's solution
B
Bromine water
C
Tollen's reagent
D
Benedict's solution
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option B.
Source: Myschool Past Questions Archive (Record #13601)
Chemistry
UTME / JAMB 1994
Atomic Structure, Orbitals & Nuclear Chemistry
Diagram
Solution
The diagram above represents an atom of
Attached Figure / Diagram
A
magnesium
B
helium
C
chlorine
D
neon
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
The diagram refers to an atom with electronic configuration 2,8,2 hence the atomic number = 12. From the periodic table, we have the atom to be Mg (Magnesium).
Source: Myschool Past Questions Archive (Record #31482)