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Chemistry
UTME / JAMB 1978
Stoichiometry, Mole Concept & Volumetric Analysis
Solution
A solid X when heated gives off a brown gas. If X is soluble in excess sodium hydroxide solution but insoluble in excess ammonium hydroxide solution, then X is
A
basic lead carbonate
B
lead (II) nitrate
C
sodium carbonate
D
zinc nitrate
E
sodium nitrate
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
Lead nitrate reacts with ammonium hydroxide solution to form a white precipitate. This white precipitate does not dissolve in excess ammonium hydroxide.
Source: Myschool Past Questions Archive (Record #7494)
Chemistry
UTME / JAMB 1978
Water, Solutions & Solubility
Diagram
Solution
Consider the solubility curves of three salts X, Y and Z given in the diagram. If each solution of the salt contains 200 g, and is heated to 100\(^o\)C, which solution or solutions will deposit 100 g of the solute when suddenly cooled to 0\(^o\)C?
Attached Figure / Diagram
A
X only
B
Y only
C
Z only
D
X and Z
E
Y and Z
medium Difficulty
Verified Correct Answer: Option E
Chemical Principles & Mechanism
If you study the curve very well, looking at the y-axis where we have the solubility, you will discover that Salt X exceeds the 100g/kg mark while Salt Y and do not. This simply implies that solutions Y and Z will deposit 100 g of the solute when suddenly cooled to 0\(^o\)C, since they didn't exceed the solubility value of 100g, abinitio.
Source: Myschool Past Questions Archive (Record #7501)
Chemistry
UTME / JAMB 1978
Particulate Nature of Matter, Laws & Formulae
Diagram
Solution
An experiment test of the Law of conservation of Mass is illustrated in the diagram. In practice, the flask is weighed before and after reaction between solutions X and Y. Which of the following pairs of solutions will be unsuitable for the experiments
Attached Figure / Diagram
A
X = hydrochloric acid; Y = silver nitrate
B
X = barium chloride; Y = dilute sulphuric acid
C
X = hydrochloric acid; Y = sodium hydroxide
D
X = hydrochloric acid; Y = lead nitrate
E
X = hydrochloric acid; Y = sodium carbonate
medium Difficulty
Verified Correct Answer: Option E
Chemical Principles & Mechanism
Option E won't be suitable because it contains HCl (acid) and Sodium carbonate ( Carbonate) which will liberate CO\(_2\). Hence the mass of the product will not be same as the mass before the reaction.
Source: Myschool Past Questions Archive (Record #7509)
Chemistry
UTME / JAMB 1978
Stoichiometry, Mole Concept & Volumetric Analysis
Five compounds R,T,W,X and Y form the following compounds: a basic hydride R.H, an acidic hydride YH, atmospheric oxide W2O3, XO2. which of the elements is an alkali
A
R
B
T
C
W
D
X
E
Y
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 #7512)
Chemistry
UTME / JAMB 1978
Stoichiometry, Mole Concept & Volumetric Analysis
Solution
The size (diameter) of five elements are in the order R < T < W < X < Y, Y being the largest. If each atom has an electron situated on its circumference, and neglecting other factors, which of the atoms will lose its electron most reluctantly?
A
R
B
T
C
W
D
X
E
Y
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
The larger the circumference of the atom, the farther the distance from the nucleus and the lesser the effect of the positively charged nucleus on the outermost electron, and vice versa hence R is the correct option
Source: Myschool Past Questions Archive (Record #7516)
Chemistry
UTME / JAMB 1978
Stoichiometry, Mole Concept & Volumetric Analysis
Solution
The size (diameter) of five elements are in the order R < T < W < X < Y, Y being the largest. If each atom has an electron situated on its circumference, and neglecting other factors, which of the atoms will lose its electron most reluctantly?
A
R
B
T
C
W
D
X
E
Y
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
The larger the circumference of the atom, the farther the distance from the nucleus and the lesser the effect of the positively charged nucleus on the outermost electron, and vice versa hence R is the correct option
Source: Official Exam / Past Question Archive
English Language
UTME / JAMB 1978
Synonyms (Nearest in Meaning)
Solution
Choose the option which is nearest in meaning to the sentences in each of the following questions.
We visited the home of one boy. That's the boy I mean.
A
that's the boy whom we visited his home
B
that's the boy whose home we visited
C
that's the boy to whose home we visited
D
that's the boy the home of whom we visited
E
purposely find a balance
medium Difficulty
Verified Correct Answer: Option B
Grammar & Contextual Explanation
"Whom" should be used as the object of a verb or preposition, not to indicate possession. "Whose" correctly indicates possession, referring to the home belonging to the boy.
Source: Official Exam / Past Question Archive
English Language
UTME / JAMB 1978
Synonyms (Nearest in Meaning)
Solution
Choose the option which is nearest in meaning to the sentences in each of the following questions.
We visited the home of one boy. That's the boy I mean.
A
that's the boy whom we visited his home
B
that's the boy whose home we visited
C
that's the boy to whose home we visited
D
that's the boy the home of whom we visited
medium Difficulty
Verified Correct Answer: Option B
Grammar & Contextual Explanation
"Whom" should be used as the object of a verb or preposition, not to indicate possession. "Whose" correctly indicates possession, referring to the home belonging to the boy.
Source: Myschool Past Questions Archive (Record #40365)
Biology
UTME / JAMB 1978
Variety of Organisms & Classification of Living Things
Solution
A plant which grows on another plant without apparent harm to the host plant is called
A
a parasite
B
an epiphyte
C
a saprophyte
D
a predator
E
a hermaphrodite
medium Difficulty
Verified Correct Answer: Option B
Biological Concept & Syllabus Guide
Epiphytes, which differ from parasites in the sense that epiphytes grow on other plants for physical support and do not necessarily negatively affect the host. Hence, epiphytes show no apparent harm to the host plant.
Source: Myschool Past Questions Archive (Record #287)
Biology
UTME / JAMB 1978
Nutrition in Plants & Animals (Photosynthesis & Food Substances)
Solution
Given the equation:
6CO\(_2\) + 6H\(_2\)O → C\(_6\)H\(_{12}\)O\(_6\) + 6O\(_2\) {Under sunlight & Chlorophyll)
The process represented by the above equation is?
A
proteinsynthesis
B
respiration
C
photosynthesis
D
transpiration
E
translocation
medium Difficulty
Verified Correct Answer: Option C
Biological Concept & Syllabus Guide
The given equation is that of photosynthesis which is the use of sunlight and chlorophyll by green plants in order to yield their food. The equation yields sugar and oxygen.
Source: Myschool Past Questions Archive (Record #290)
Biology
UTME / JAMB 1978
Nutrition in Plants & Animals (Photosynthesis & Food Substances)
Solution
Given the equation:
6CO\(_2\) + 6H\(_2\)O → C\(_6\)H\(_{12}\)O\(_6\) + 6O\(_2\) (Under sunlight & Chlorophyll)
The oxygen given off during the above process is derived from
A
sunlight
B
chlorophyll
C
carbon dioxide
D
atmosphere
E
water
medium Difficulty
Verified Correct Answer: Option E
Biological Concept & Syllabus Guide
The oxygen given of by plants is from WATER which is split during photolysis(splitting of water by sunlight).
Source: Myschool Past Questions Archive (Record #291)
Biology
UTME / JAMB 1978
Supporting Tissues & Skeletal System
Solution
One of the function of xylem is
A
strengthening the stem
B
manufacturing food
C
reducing loss of water
D
conducting manufactured food
E
storing unused sugar
medium Difficulty
Verified Correct Answer: Option A
Biological Concept & Syllabus Guide
Xylem plays an essential 'supporting' role providing strength to tissues and organs, to maintain plant architecture and resistance to bending.
While the primary role of Xylem is to transport water and dissolved mineral salts upward from the roots, it serves a dual purpose. Mature xylem vessels and tracheids contain thick cell walls heavily reinforced with lignin. This structural compound provides immense mechanical strength and rigidity, directly supporting and strengthening the plant stem to keep it upright.
Source: Myschool Past Questions Archive (Record #293)
Biology
UTME / JAMB 1978
Nervous, Hormonal Coordination & Sense Organs
Solution
People suffering from myopia
A
can see near object clearly
B
can see far away object clearly
C
cannot see any object clearly
D
are colour blind
E
are able to see clearly in the dark
medium Difficulty
Verified Correct Answer: Option A
Biological Concept & Syllabus Guide
Myopia is another name given to short- sightedness. Affected persons see close objects clearly but far objects are blurry and would take correction to get from a distance fixed on their retina.
Source: Myschool Past Questions Archive (Record #296)
Biology
UTME / JAMB 1978
Variety of Organisms & Classification of Living Things
Solution
The cilia in paramecium are use for
A
respirating
B
locomotion
C
protection
D
regulating food intake
E
excretion
medium Difficulty
Verified Correct Answer: Option B
Biological Concept & Syllabus Guide
Cilia have important functions in the life of Paramecium, such as locomotion through the surrounding water and ingestion of food into the cytostome.
Source: Myschool Past Questions Archive (Record #298)
Biology
UTME / JAMB 1978
Variety of Organisms & Classification of Living Things
Solution
Euglena may be classified as a plant because it
A
has chloroplast
B
has a gullet
C
lives in a pond
D
possesses a flagellum
E
has pellicle
medium Difficulty
Verified Correct Answer: Option A
Biological Concept & Syllabus Guide
Most euglena have chloroplasts, which is a basic characteristics of plants.
Source: Myschool Past Questions Archive (Record #299)