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Chemistry
UTME / JAMB 1997
Chemical Energetics & Thermochemistry
Solution
\(\frac{1}{2}\)N\(_2\)(g) + \(\frac{1}{2}\)O\(_2\)(g) → NO(g) ∆H^\circ = 89 KJ mol\(^{-1}\). If the entropy change for the reaction above at 25^\circC is 11.8 J mol\(^{-1}\), calculate the change in free energy. ∆G^\circ, for the reaction at 25^\circC?
A
88.71 KJ
B
85.48 KJ
C
-204.00 KJ
D
-3427.40 KJ
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
\(\frac{1}{2}\)N\(_2\)(g) + \(\frac{1}{2}\)O\(_2\)(g) → NO(g) ∆H^\circ = 89 KJ mol\(^{-1}\)
First, ensure the right conversion is made.
T\(^0\)C = 25 + 273 = 298K
∆S = 11.8 = \(\frac{11.8}{1000}\) = 0.0118 kJmol\(^{-1}\) (Conversion from J/mol to kJ/mol)
∆H = 89 kJmol\(^{-1}\)
Applying the formula; ∆G\(^0\) = ∆H - T∆S
= 89 - (298 x 0.0118)
= 89 - 3.5164
= 85.4836
= 85.48 kJmol\(^{-1}\)
Source: Myschool Past Questions Archive (Record #13860)
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
Biology
UTME / JAMB 1997
Cell Structure, Organization & Cell Division
Diagram
The structure labelled I is the
Attached Figure / Diagram
A
Golgi body
B
mitochondrion
C
endoplasmic reticulum
D
vacuole
medium Difficulty
Verified Correct Answer: Option C
Biological Concept & Syllabus Guide
No expanded working has been attached for this question yet. The verified answer is Option C.
Source: Myschool Past Questions Archive (Record #5679)
Biology
UTME / JAMB 1997
Variety of Organisms & Classification of Living Things
Which of the following performs similar functions?
A
Ascospores ans ascocarp
B
Antherozoids and rhizoids
C
sorus and indusium
D
Strobili and inflorescence
medium Difficulty
Verified Correct Answer: Option C
Biological Concept & Syllabus Guide
No expanded working has been attached for this question yet. The verified answer is Option C.
Source: Myschool Past Questions Archive (Record #5701)
Biology
UTME / JAMB 1997
Cell Structure, Organization & Cell Division
Solution
In ferns, the sporophyte
A
develops from a haploid zygote
B
reproduce asexually to produce spores
C
is haploid and dependant on gametophyte
D
is diploid and independent of the gametophyte
medium Difficulty
Verified Correct Answer: Option D
Biological Concept & Syllabus Guide
In the life cycle of a fern, there is an alternation of generations between a haploid gametophyte and a diploid sporophyte.
Diploid Nature: The sporophyte is the familiar, leafy fern plant and is diploid (2n) because it develops from a zygote formed by the fusion of two haploid gametes.
Independence: While the young sporophyte initially depends on the gametophyte for nutrition, it quickly develops its own roots and leaves, becoming photosynthetic and independent as the gametophyte eventually withers away. It is the dominant phase of the fern life cycle.
Source: Myschool Past Questions Archive (Record #5703)
Biology
UTME / JAMB 1997
Reproduction in Plants & Animals
The group of insects that undergoes complete metamorphosis is
A
houseflies, beetles and cockroaches
B
cockroaches, grasshoppers and bees
C
houseflies, beetles and butterflies
D
aphids, grasshopper and butterflies
medium Difficulty
Verified Correct Answer: Option C
Biological Concept & Syllabus Guide
No expanded working has been attached for this question yet. The verified answer is Option C.
Source: Myschool Past Questions Archive (Record #5707)
Biology
UTME / JAMB 1997
Excretion & Homeostasis
The nitrogenous substance that is excreted by birds in order to conserve water is
A
ammonia
B
urea
C
uric acid
D
nitric acid
medium Difficulty
Verified Correct Answer: Option C
Biological Concept & Syllabus Guide
No expanded working has been attached for this question yet. The verified answer is Option C.
Source: Myschool Past Questions Archive (Record #5709)