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English Language
WAEC / WASSCE 2009
Lexis, Structure & Register (Cloze & Vocabulary)
In question numbered 95 above, choose the best option from letters A - D that best completes the gap.
A
waves
B
bubbles
C
foam
D
signs
medium Difficulty
Verified Correct Answer: Option A
Grammar & Contextual Explanation
No expanded working has been attached for this question yet. The verified answer is Option A.
Source: Myschool Past Questions Archive (Record #25929)
English Language
WAEC / WASSCE 2009
Lexis, Structure & Register (Cloze & Vocabulary)
In question numbered 96 above, choose the best option from letters A - D that best completes the gap.
A
level
B
size
C
scale
D
base
medium Difficulty
Verified Correct Answer: Option C
Grammar & Contextual Explanation
No expanded working has been attached for this question yet. The verified answer is Option C.
Source: Myschool Past Questions Archive (Record #25930)
English Language
WAEC / WASSCE 2009
Lexis, Structure & Register (Cloze & Vocabulary)
In question numbered 97 above, choose the best option from letters A - D that best completes the gap.
A
embankment
B
bank
C
cliff
D
bridge
medium Difficulty
Verified Correct Answer: Option B
Grammar & Contextual Explanation
No expanded working has been attached for this question yet. The verified answer is Option B.
Source: Myschool Past Questions Archive (Record #25931)
English Language
WAEC / WASSCE 2009
Lexis, Structure & Register (Cloze & Vocabulary)
In question numbered 98 above, choose the best option from letters A - D that best completes the gap.
A
ships
B
trawlers
C
canoes
D
boats
medium Difficulty
Verified Correct Answer: Option B
Grammar & Contextual Explanation
No expanded working has been attached for this question yet. The verified answer is Option B.
Source: Myschool Past Questions Archive (Record #25932)
English Language
WAEC / WASSCE 2009
Lexis, Structure & Register (Cloze & Vocabulary)
In question numbered 99 above, choose the best option from letters A - D that best completes the gap.
A
crates
B
baskets
C
nets
D
cages
medium Difficulty
Verified Correct Answer: Option C
Grammar & Contextual Explanation
No expanded working has been attached for this question yet. The verified answer is Option C.
Source: Myschool Past Questions Archive (Record #25933)
English Language
WAEC / WASSCE 2009
Lexis, Structure & Register (Cloze & Vocabulary)
In question numbered 100 above, choose the best option from letters A - D that best completes the gap.
A
catch
B
get
C
kill
D
attract
medium Difficulty
Verified Correct Answer: Option A
Grammar & Contextual Explanation
No expanded working has been attached for this question yet. The verified answer is Option A.
Source: Myschool Past Questions Archive (Record #25934)
Chemistry
NECO SSCE 2009
Oxidation, Reduction & Redox Reactions
The following equations represent redox reactions EXCEPT
A
Ba2+(aq) + SO2-4 (aq) → BaSO4(s)
B
Cl2(g) + 2Br- (aq) → 2CI - (aq) + Br2(g)
C
Fe2+(aq) + ½ C I2(aq) → Fe3+ (aq) + CI-(aq)
D
2Fe3+(aq) + Sn2+(aq) → 2Fe2+(aq) Sn4+ (aq)
E
Zn(s) + CU2+(aq) → Zn2+(aq) + CU(s)
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: Official Exam / Past Question Archive
Chemistry
WAEC / WASSCE 2009
Acids, Bases, pH & Salts
Solution
(a) List three pieces of apparatus required for the evaporation of sodium chloride solution to dryness.
(b)(i) List two normal salts which when dissolved in water turn red litmus blue.
(ii) State the phenomenon that is responsible for the action on the litmus in (b)(i).
(c) State what would be observed on adding BaCl\(_2\) solution to a portion of a saturated Na\(_2\)CO\(_3\), followed by dilute HCI in excess.
(i) A gas Q decolourized acidified KMnO\(_4\) solution. Suggest what Q could be.
medium Difficulty
Verified Correct Answer: Option
Chemical Principles & Mechanism
(a) Vaporating dish
- Bunsen Burner
- Tripod stand / wire guaze
(b)(i) Na\(_2\)CO\(_3\)
- K\(_2\)CO\(_3\)
- CH\(_3\)COONa
(ii) hydrolysis
(c)(i) White precipitate, effervescence, precipitate dissolves
(ii) SO\(_2\)/H\(_2\)S/unsaturated gaseous hydrocarbon
Source: Myschool Past Questions Archive (Record #60027)
Chemistry
WAEC / WASSCE 2009
Nature of Matter & Separation Techniques
Solution
Credit will be given for strict adherence to the instructions, for observations precisely recorded and for accurate inferences. All tests, observations and inferences must be clearly entered in your answer book in ink, at the time they are made.
C is a mixture of two salts. Carry out the following exercises on C. Record your observations and identify any gas(es) evolved. State the conclusion you draw from the result of each test.
(a) Put all of C in a test tube and add about 10 cm\(^3\) of distilled water. Shake thoroughly and filter. Keep both the filtrate and the residue. Divide the filtrate into three portions.
(i) To the first portion, add NaOH\(_{(ag)}\) in drops and then in excess.
(ii) To the second portion, add NH\(_3\), solution in drops and then in excess.
(iii) To the third portion, add BaCl\(_{2(aq)}\) followed by dilute HCI.
(b) Divide the residue into two portions.
(i) Heat the first portion strongly in a test tube.
(ii) Add dilute HCI to the second portion.
medium Difficulty
Verified Correct Answer: Option
Chemical Principles & Mechanism
Tes
Observation
Inference
(a)(i) C + H\(_2\)O, then filter
(ii) Filterate + NaOH\(_{(aq)}\) in drops,
then in excess
(iii) Filterate + NH\(_{3(aq)}\) in drops,
then in excess
(iv) Filterate + BaCl\(_{2(aq)}\) + dil. HCl
(b)(i) First portion of residue + heat
(i) Second portion of residue + dil. HCl
Green residue, blue filterate
Blue gelatinous precipitate
insoluble in excess
Pale blue (gelatinous) precipitate
ppt dissolves/soluble in excess to give a deep blue solution
White precipitate insoluble in dil. HCl
Colour changed from green to black powder
Effervescence, colourless, odourless gas which turned lime water milky
C is a mixture of soluble and insoluble salts
Cu\(^{2+}\) present
Cu\(^{2+}\) confirmed
SO\(_4^{2-}\) confirmed
Gas is CO\(_2\) from CO\(_3^2\)
Source: Myschool Past Questions Archive (Record #60028)
Chemistry
WAEC / WASSCE 2009
Stoichiometry, Mole Concept & Volumetric Analysis
Solution
Burette readings (initial and final reading) must be given to two decimal places. Volume of pipette used must also be recorded but no account of experimental procedure is required. All calculations must be done in your answer book.
A is 0.0950 mol dm\(^{-3}\) HCI. B is a solution 13.50g dm\(^{-3}\) of X\(_2\)CO\(_3\).10H\(_2\)O.
(a) Put A into the burette and titrate it against 20.0 cm\(^3\) or 25.0 cm\(^3\) portions öf B using methyl orange as an indicator. Tabulate your readings and calculate the average volume of A used.
(b) From your results and the information provided above, calculate the;
(i) concentration of B in mol dm\(^{-3}\);
(ii) molar mass of X\(_2\)CO\(_3\).10H\(_2\)O in g mol\(^{-1}\);
(iii) percentage by mass X in X\(_2\)C)\(_3\).10H\(_2\)O. [H = 1, C = 12, O = 16]. The equation for the reaction involved in the titration is 2HCl\(_{(aq)}\) + X\(_2\)CO\(_3\).10H\(_2\)O\(_{(aq)}\) \(\to\) 2XCl\(_{(aq)}\) + 11H\(_2\)O\(_{(l)}\) + CO\(_{2(g)}\)
medium Difficulty
Verified Correct Answer: Option
Chemical Principles & Mechanism
Volume of pipette = 25.00 cm\(^{3}\)
indicator used = methyl orange
colour change at end point yellow to orange/purple
Burette Reading
Rough
(1) First
(2nd) Second
(3rd) Third
Final (cm\(^3\))
25.20
24.90
24.80
24.82
Initial (cm\(^3\))
0.00
0.00
0.00
0.00
Volume of acid used
25.20
24.00
24.80
24.85
Average volume of A used = \(\frac{24.90 + 24.80 + 24.85}{3}\) = 24.85 cm\(^3\)
The equation for the reaction
X\(_2\)CO\(_3\).10H\(_2\)O\(_{(aq)}\) + 2HNO\(_{3(aq)}\) \(\to\) 2 x 2NO\(_{3(aq)}\) + CO\(_{2(g)}\) + 11HNO\(_{(l)}\)
(b)(i) Mole ratio of Acid to Base is 2:1
concentration of B in mol. dm\(^{-3}\)
\(\frac{C_AV_A}{C_BV_B} = \frac{2}{1}\)
C\(_B\) = \(\frac{C_AV_A}{2V_B}\)
C\(_B\) = \(\frac{0.0950 \times 24.85}{2 \times 25}\)
= \(\frac{2.36075}{50}\)
= 0.0472 mol. dm\(^{-3}\)
(ii) Molar mass B in g mol\(^{-1}\)
Molar mass X\(_2\)CO\(3\).10H\(_2\)O = \(\frac{\text{mass concentration gdm}^{-3}}{\text{molar concentration of B in moldm}^{-3}}\)
= \(\frac{13.5 gdm^{-3}}{0.0472 moldm^{-3}}\)
= 286 g mol\(^{-1}\)
(iii) Percentage by mass of X
X\(_2\)CO\(_3\).10H\(_2\)O = 286g
i.e. relative molar mass of X\(_2\)CO\(_3\)
= 2x + 12 + (16 x 3) + 10(2 x 1) + 16 = 286
= 2x + 12 + 48 + 180 = 286
= 2x + 240 = 286
2x = 286 - 240 = 46
x = \(\frac{46}{2}\)
= 23 gmol\(^{-1}\)
Percentage by mass of X = \(\frac{2 \times 23}{286} \times \frac{100}{1}\)
= 16.08%
Source: Myschool Past Questions Archive (Record #60029)
English Language
UTME / JAMB 2009
Lexis, Structure & Register (Cloze & Vocabulary)
In question number 25 above, choose the best option from letters A-D that best completes the gap.
A
analyze
B
present
C
organize
D
discuss
medium Difficulty
Verified Correct Answer: Option A
Grammar & Contextual Explanation
No expanded working has been attached for this question yet. The verified answer is Option A.
Source: Official Exam / Past Question Archive
English Language
NECO SSCE 2009
Oral English: Stress, Rhymes & Intonation
Choose from the options lettered A - E the one that has a different stress pattern from the other four.
A. Ahead
B. aloud
C. behold
D. decode
E. goalpost
A
B
B
E
C
D
D
C
E
A
medium Difficulty
Verified Correct Answer: Option B
Grammar & Contextual Explanation
No expanded working has been attached for this question yet. The verified answer is Option B.
Source: Myschool Past Questions Archive (Record #43933)
English Language
NECO SSCE 2009
Idioms, Figurative Expressions & Sentence Interpretation
From the options lettered A - E, choose the one that is the most appropriate interpretation of the expression in italics
After Uduak had killed his wife, he attempted to cover his tracks by making her death appear like suicide. This means that Uduak
A
covered the face of his dead wife with a track-suit
B
decided to raise an alarm
C
insisted on killing himself too
D
tried to hide what he had done
E
was embittered about the act
medium Difficulty
Verified Correct Answer: Option D
Grammar & Contextual Explanation
No expanded working has been attached for this question yet. The verified answer is Option D.
Source: Myschool Past Questions Archive (Record #43934)
English Language
NECO SSCE 2009
Oral English: Vowel & Consonant Sounds
Choose from the options lettered A - E the one that has the same vowel sound as the one represented by the underlined letter(s)
bed
A
paid
B
people
C
prayed
D
quay
E
said
medium Difficulty
Verified Correct Answer: Option E
Grammar & Contextual Explanation
No expanded working has been attached for this question yet. The verified answer is Option E.
Source: Myschool Past Questions Archive (Record #43936)
English Language
NECO SSCE 2009
Oral English: Vowel & Consonant Sounds
Choose from the options lettered A - E the one that contains the sound segment represented by the given phonetic symbol
/i:/
A
kill
B
live
C
say
D
suite
E
will
medium Difficulty
Verified Correct Answer: Option D
Grammar & Contextual Explanation
No expanded working has been attached for this question yet. The verified answer is Option D.
Source: Myschool Past Questions Archive (Record #43937)