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Chemistry
UTME / JAMB 1997
Stoichiometry, Mole Concept & Volumetric Analysis
Diagram
Use the graph above to answer this question. A sample, X, solid at room temperature, was melted, heated to a temperature of 358 K and allowed to cool as shown in OPQR. The section PQ indicates that X is
Attached Figure / Diagram
A
a mixture of salts
B
a hydrated salt
C
an ionic salt
D
a pure compound
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 #31533)
Chemistry
UTME / JAMB 1997
Stoichiometry, Mole Concept & Volumetric Analysis
Diagram
Use the graph above to answer this question. A sample, X, solid at room temperature, was melted, heated to a temperature of 358 K and allowed to cool as shown in OPQR.The section OP suggests that X is in the
Attached Figure / Diagram
A
liquid sate
B
solid/liquid state
C
solid state
D
gaseous state
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 #31534)
Chemistry
UTME / JAMB 1997
Non-Metals & Their Compounds
Diagram
Solution
In the diagram above the gas Y could be
Attached Figure / Diagram
A
hydrogen chloride
B
oxygen
C
carbon (IV) oxide
D
chlorine
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
- Two gases that can be used in the study of fountain experiment is ammonia gas and hydrogen chloride gas.
- Ammonia dissolves into the water and the pressure in the container drops. As a result, more water is forced into the container from another inlet creating a fountain effect.
- All the hydrogen chloride in the flask dissolves in the water drops from the pipette, creating a vacuum in the flask. Water is then sucked up at great speed from the bowl, creating a spectacular 'fountain' in the flask.
Source: Myschool Past Questions Archive (Record #31536)
Chemistry
UTME / JAMB 1997
Stoichiometry, Mole Concept & Volumetric Analysis
Diagram
Solution
The IUPAC nomenclature of the organic compound with the above structural formula is
Attached Figure / Diagram
A
3-ethyl-2,5-dimethylhexane
B
4-ethyl-2,5-dimethylhexane
C
3-ethyl-2,5,5 - trimethylpentane
D
3-ethyl, 1,1,4-trimethylpentane
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
The name of the compound is 3 - ethyl - 2,5 - dimethylhexane.
Source: Myschool Past Questions Archive (Record #31539)
Chemistry
UTME / JAMB 1997
Organic Chemistry I: Hydrocarbons & Crude Oil
Diagram
How many more isomers of the compound above can be obtained ?
Attached Figure / Diagram
A
5
B
4
C
3
D
2
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 #31542)
Chemistry
UTME / JAMB 1997
Stoichiometry, Mole Concept & Volumetric Analysis
Diagram
Choose the correct answer from the options above. When Fehling is solution is added to two isomeric carbonyl compounds X and Y with the molecular formula C 5H 10O, compound X gives a red precipitate while Y does not react. It can be inferred that X is
Attached Figure / Diagram
A
A
B
B
C
C
D
D
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 #31544)
Chemistry
UTME / JAMB 1997
Chemical Bonding & Intermolecular Forces
Diagram
Solution
The compound above contains
Attached Figure / Diagram
A
Sp 3 hybridized carbon atoms only
B
Sp 2 hybridized carbon atoms only
C
Sp 3 and Sp hybirdized carbon atoms
D
Sp 3 and Sp 2
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
The structure comprises a benzene ring ( C\(_6\)H\(_5\) ) with a CH\(_2\)-CH\(_3\) substituent attached to it.
Recall that benzene is aromatic compound, as well as conjugated compound having three double bonds and three single bonds.
If we re-write the molecular formular of the compound,trying to represent on a straight chain just for better understanding, we'll have -CH=CH-CH=CH-CH=CH-CH\(_2\)-CH\(_3\)
Whenever you are solving questions on Hybridization of Hydrocarbons, always use this key:
If the compound contains a Carbon atom + single bonded to 4 atoms - SP\(^3\)
If the compound contains a Carbon atom + one double bond + two single bonds - SP\(^2\)
If the compound contains a Carbon atom + a triple bond + one single bond - SP
SP\(^2\) SP\(^2\) SP\(^3\)
-CH=CH-CH=CH-CH=CH-CH\(_2\)-CH\(_3\)
There's no triple bond, hence there will be no SP hybridization but we only have SP\(^3\) an SP\(^2\) because of the criteria stated above.
Source: Myschool Past Questions Archive (Record #31545)
Chemistry
UTME / JAMB 1997
Stoichiometry, Mole Concept & Volumetric Analysis
Diagram
The compound above is the product of the oxidation of
Attached Figure / Diagram
A
2-methlbutan-2-ol
B
2-methylbutan -1- ol
C
2, 3-dimethylprop 1-ol
D
Pentan -2- ol
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 #31546)
Chemistry
UTME / JAMB 1997
Stoichiometry, Mole Concept & Volumetric Analysis
The compound above is the product of the oxidation of
A
2-methlbutan-2-ol
B
2-methylbutan -1- ol
C
2, 3-dimethylprop 1-ol
D
Pentan -2- ol
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: Official Exam / Past Question Archive
Chemistry
WAEC / WASSCE 1997
Water, Solutions & Solubility
Solution
The phenomenon observed when dust particles collide randomly in a beam of sunlight is known as?
A
Tyndal effect
B
diffusion
C
osmosis
D
brownian movement
E
dialysis
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
The correct answer is: Tyndall effect.
The Tyndall effect is the scattering of light by particles in a colloid or in a very fine suspension. When a beam of sunlight passes through a colloidal solution, the particles scatter the light, making it visible. This is why we see a beam of light when dust particles are present in the air.
Brownian movement, on the other hand, refers to the random motion of particles suspended in a fluid (such as a gas or liquid) due to collisions with the surrounding fluid molecules.
So, while Brownian movement is related to the motion of particles, the Tyndall effect is specifically about the scattering of light by particles!
Source: Myschool Past Questions Archive (Record #36532)
Chemistry
WAEC / WASSCE 1997
Atomic Structure, Orbitals & Nuclear Chemistry
The mass number of an element is the sum of its
A
electrons, neutrons and protons
B
electrons and protons
C
protons and neutrons
D
orbital electrons
E
valence electrons
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 #36533)
Chemistry
WAEC / WASSCE 1997
Atomic Structure, Orbitals & Nuclear Chemistry
How many unpaired electrons are there in an atom of an element with the following electronic configuration? 1s22s22p6
A
o
B
1
C
2
D
6
E
8
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 #36534)
Chemistry
WAEC / WASSCE 1997
Atomic Structure, Orbitals & Nuclear Chemistry
Radon is used as a tracer in medical research because it
A
is monatomic
B
is radioactive
C
is a noble gas
D
has a complete valence shell
E
has a low boiling point
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 #36535)
Chemistry
WAEC / WASSCE 1997
Periodic Table & Periodicity
What is the most probable group of an element which is a soft, silvery white solid and reacts violently with water?
A
Group 0
B
Group 1
C
Group 4
D
Group 6
E
Group 7
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 #36536)
Chemistry
WAEC / WASSCE 1997
Chemical Bonding & Intermolecular Forces
In linear molecules, the bond angle is
A
90o
B
140o
C
109o
D
120o
E
180o
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 #36537)