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English Language
WAEC / WASSCE 2010
Idioms, Figurative Expressions & Sentence Interpretation
Solution
After each of the following sentences, a list of possible interpretations of the sentence is given. Choose the interpretation that you consider most appropriate for each sentence.
Some candidates takes examinations in their stride.This means that they
A
prepare hard for them
B
do not worry about them
C
find them insurmountable
D
are familiar with them
medium Difficulty
Verified Correct Answer: Option B
Grammar & Contextual Explanation
Taking something in someone's stride basically means to deal with a problem or difficulty calmly and not to allow it to influence what you are doing:
Source: Myschool Past Questions Archive (Record #25963)
Chemistry
WAEC / WASSCE 2010
Chemical Energetics & Thermochemistry
Solution
(a) An aqueous solution of salt Q was added to excess Sodium trioxocarbonate (V) solution in a test tube. There was effervescence, the test tube became warm and a white precipitate was observed. State three inferences that could be drawn from these observations.
(b) Consider the following salts: NH\(_4\)CI; PbSO\(_4\); NaHCO\(_3\), Cu(NO\(_3\))\(_2\) and ZnCO\(_3\). Select from the list, the salt(s) which;
(i) do not/does not readily dissolve in water;
(i) produce(s) effervescence with dilute mineral acids;
(ii) decompose(s) on heating
(iv) dissolves(s) in water to form an alkaline solution;
(v) sublime(s) on heating.
medium Difficulty
Verified Correct Answer: Option
Chemical Principles & Mechanism
(a) The solution of salt Q was acidic/acid solution
- CO\(_2\)/carbon (IV) oxide was given off
- the reaction was exothermic (i.e. Heat is given off)
- an insoluble compound was formed
(b)(i) PbSO\(_4\) and ZnCO\(_3\)
(ii) NaHCO\(_3\) and ZnCO\(_3\)
(iii) NH\(_4\)Cl, NaHCO\(_3\), Cu(NO\(_3\))\(_2\) and ZnCO\(_3\)
(v) NH\(_4\)Cl
Source: Myschool Past Questions Archive (Record #60023)
Chemistry
WAEC / WASSCE 2010
Oxidation, Reduction & Redox Reactions
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 and D are inorganic salts. X is a solution of an inorganic compound. Carry out the following exercises on C, D and X. Record your observations and identity any gas(es) involved. State the conclusion drawn from the result or each test.
(a)(i) Add about 5 cm\(_3\) of distilled water to C in a test tube and shake thoroughly, Divide the resulting solution into two portions.
(ii) Put about 2cm\(^3\) of X into a separate test tube and add the first portion of solution in (a)(i) To the second portion of the resulting solution in (a)(i), add few drops of BaCl\(_{2(aq)}\) followed by excess dil. HCI.
(b) Add about 10 cm of distilled water to D in a boiling tube and shake thoroughly.
(i) To about 2 cm\(^3\) portion of the resulting solution in a test tube, add NaOH\(_{(aq)}\) in drops and then in excess
(ii) To another 2 cm\(^3\) portion of the resulting solution add few drops of K\(_2\)CrO\(_{4(aq)}\)
medium Difficulty
Verified Correct Answer: Option
Chemical Principles & Mechanism
Test
Observation
Inference
(a)(i)
C\(_{(s)}\)
C dissolved to give a colourless solution
(ii)
C\(_{(aq)}\) + X\(_{(aq)}\)
X decolourized/turned colourless
C is a reducing agent
(iii)
C\(_{(aq)}\) + BaCl\(_{2(aq)}\)
White precipitate
SO\(_4^{2-}\), SO\(_3^{2-}\) or S\(^{2-}\) or SO\(_3^{2-}\)
+ excess HCl\(_{(aq)}\)
precipitate dissolved/precipitate soluble
SO\(^{2-}_3\) confirmed
(b)
D\(_{(s)}\) + distilled water
D dissolved to give a colourless solution
(i)
D\(_{(aq)}\)
NaOH\(_{(aq)}\) in drops
+ excess NaOH
White precipitate
precipitate dissolved/precipitate
Pb\(^{2+}\) or Ca\(^{2+}\)
Pb\(^{2+}\)
(ii)
D\(_{(aq)}\) + K\(_2\)CrO\(_{(aq)}\)
Yellow precipitate
Pb\(^{2+}\) confirmed
Source: Myschool Past Questions Archive (Record #60024)
Chemistry
WAEC / WASSCE 2010
Stoichiometry, Mole Concept & Volumetric Analysis
Solution
Burette readings (initial and final) must be given to two decimal places. Volume or pipete used must also be recorded but no account of experimental procedure is required. All calculations must be done in your answer book.
A is a solution containing 12.0g dm\(^{-3}\) NaHSO\(_4\) NaHSO\(_4\) P is a solution containing NaOH
(a) Put A into the burette and titrate it against 20.0cm\(^3\) or 25.0m\(^3\) portions of B using methyl orange as an indicator. Repeat the titration to obtain consistent titres. Tabulate your readings and calculate the average volume A used. The equation for the reaction involved in the titration is ;
NaHSO\(_{4(aq)}\) + NaOH\(_{(aq)}\) \(\to\) Na\(_2\)SO\(_{4(aq)}\) + H\(_2\)O\(_{(l)}\)
[H 1.00, O = 16.0; Na = 23.0, S = 32.0]
(b) From your results and the information provided above calculate the:
(i) concentration of A in mol dm\(^{-3}\)
(ii) concentration of B in mol dm\(^{-3}\)
(iii) mass of Na\(^+\) formed in solution during the titration.
medium Difficulty
Verified Correct Answer: Option
Chemical Principles & Mechanism
(a) Volume of base used (pipette) = 25.00 cm\(^3\); indicator - methyl orange
Burette reading cm\(^3\)
Rough
1st Titration
2nd Titration
Final burette readings (cm\(^3\))
21.70
43.30
31.90
Initial burette readings (cm\(^3\))
0.00
21.60
10.30
Volume of acid used (cm\(^3\))
21.70
21.60
21.60
Average volume of acid = \(\frac{21.60 + 21.60}{2}\)
V\(_A\) = 21.60cm\(^3\)
(b)(i) Concentration of A in mol dm\(^{-3}\)
Molar mass of NaHSO\(_4\) = 23 + 1 + 32 + (4 x 16) = 120g mol\(^{-1}\)
Concentration of A I mol/dm3 = \(\frac{ mass concentration of A}{Molar mass of A}\)
= \(\frac{12.0}{120}\) = 0.100mol\(dm^3\)
(ii) concentration of B in mol dm\(^{-3}\)
\(\frac{C_AV_A}{C_BV_B}\) = 1
C\(_B\) = \(\frac{C_AV_A}{V_B}\)
= \(\frac{0.10 \times 21.6}{25}\)
= 0.0864 mol dm\(^{-3}\) (3 s.fig)
iii) Mass of \(Na^+\) formed in solution . Amount of NaOH in the solution = \(\frac{25 \times0.0864}{1000}\) = 0.00216 moles
Mole ratio NaOH : \(Na_{2}SO_{4}\) = 1 : 1 Amount of \(Na_{2}SO_{4}\) = 0.00216 moles. Atomic mass of \(Na^+\) = 23
Amount of \(Na^+\) = 2 x 0.00216. Mass of \(Na^+\) formed = 23 x 2 x 0.00216 = 0.9936g. ⇒ 0.10g
Source: Myschool Past Questions Archive (Record #60025)
English Language
WAEC / WASSCE 2010
Synonyms (Nearest in Meaning)
Solution
From the words lettered A to D below each of the following sentences, choose the word that is nearest in meaning to the underlined word.
The provocation had an instantaneous effect on him.
A
a lasting
B
an immediate
C
a terrifying
D
a momentous
medium Difficulty
Verified Correct Answer: Option B
Grammar & Contextual Explanation
Instantaneous; occurring or done instantly
Source: Myschool Past Questions Archive (Record #25964)
English Language
WAEC / WASSCE 2010
Synonyms (Nearest in Meaning)
Solution
From the words lettered A to D below each of the following sentences, choose the word that is nearest in meaning to the underlined word.
I woke up feeling rather queer
A
fine
B
strange
C
strong
D
tried
medium Difficulty
Verified Correct Answer: Option B
Grammar & Contextual Explanation
Queer; strange; odd.
Source: Myschool Past Questions Archive (Record #25965)
English Language
WAEC / WASSCE 2010
Synonyms (Nearest in Meaning)
Solution
From the words lettered A to D below each of the following sentences, choose the word that is nearest in meaning to the underlined word.
If he declines the offer, it will be better for him.
A
ignores
B
denies
C
snubs
D
rejects
medium Difficulty
Verified Correct Answer: Option D
Grammar & Contextual Explanation
Declines; politely refuse (an invitation or offer).
Source: Myschool Past Questions Archive (Record #25966)
English Language
WAEC / WASSCE 2010
Synonyms (Nearest in Meaning)
Solution
From the words lettered A to D below each of the following sentences, choose the word that is nearest in meaning to the underlined word.
Our club encourages benevolence
A
affluence
B
sincerity
C
charity
D
association
medium Difficulty
Verified Correct Answer: Option C
Grammar & Contextual Explanation
Benevolence; the quality of being well meaning; kindness.
Source: Myschool Past Questions Archive (Record #25967)
English Language
WAEC / WASSCE 2010
Synonyms (Nearest in Meaning)
Solution
From the words lettered A to D below each of the following sentences, choose the word that is nearest in meaning to the underlined word.
Such utterances are inimical to the peaceful co-existence of the two communities
A
unhelpful
B
unimportant
C
harmful
D
useless
medium Difficulty
Verified Correct Answer: Option C
Grammar & Contextual Explanation
Inimical; tending to obstruct or harm. unfriendly; hostile.
Source: Myschool Past Questions Archive (Record #25968)
English Language
WAEC / WASSCE 2010
Synonyms (Nearest in Meaning)
Solution
From the words lettered A to D below each of the following sentences, choose the word that is nearest in meaning to the underlined word.
The chairman observed that Andrew was the most qualified candidate for the job
A
suitable
B
accommodating
C
responsible
D
interesting
medium Difficulty
Verified Correct Answer: Option A
Grammar & Contextual Explanation
Qualified; competent or knowledgeable enough to do something.
Source: Myschool Past Questions Archive (Record #25969)
English Language
WAEC / WASSCE 2010
Synonyms (Nearest in Meaning)
Solution
From the words lettered A to D below each of the following sentences, choose the word that is nearest in meaning to the underlined word.
What do you intend to do with these inanimate objects?
A
lively
B
fascinating
C
precious
D
lifeless
medium Difficulty
Verified Correct Answer: Option D
Grammar & Contextual Explanation
Inanimate; not alive.
Source: Myschool Past Questions Archive (Record #25970)
English Language
WAEC / WASSCE 2010
Synonyms (Nearest in Meaning)
Solution
From the words lettered A to D below each of the following sentences, choose the word that is nearest in meaning to the underlined word.
Everybody noticed that the chairman's excuse was lame
A
verbose
B
precise
C
unsatisfactory
D
unconditional
medium Difficulty
Verified Correct Answer: Option C
Grammar & Contextual Explanation
Lame; unconvincingly feeble, weak
Source: Myschool Past Questions Archive (Record #25971)
English Language
WAEC / WASSCE 2010
Synonyms (Nearest in Meaning)
Solution
From the words lettered A to D below each of the following sentences, choose the word that is nearest in meaning to the underlined word.
The president appointed staunch supporters of his policies as advisers.
A
trusted
B
critical
C
affluent
D
strong
medium Difficulty
Verified Correct Answer: Option A
Grammar & Contextual Explanation
staunch; very loyal and committed in attitude. Trust worthy.
Source: Myschool Past Questions Archive (Record #25972)
English Language
WAEC / WASSCE 2010
Synonyms (Nearest in Meaning)
Solution
From the words lettered A to D below each of the following sentences, choose the word that is nearest in meaning to the underlined word.
The little boy gave his candid opinion of the incident.
A
quick
B
brief
C
frank
D
hurried
medium Difficulty
Verified Correct Answer: Option C
Grammar & Contextual Explanation
candid; truthful and straightforward; frank.
Source: Myschool Past Questions Archive (Record #25973)
English Language
WAEC / WASSCE 2010
Concord (Subject-Verb Agreement)
Solution
From the words lettered A to D, choose the word that best completes each of the following sentences:
Why are you always jealous.............other people?
A
of
B
at
C
about
D
with
medium Difficulty
Verified Correct Answer: Option A
Grammar & Contextual Explanation
Why are you always jealous of other people?
Of; expressing the relationship between a part and a whole
Source: Myschool Past Questions Archive (Record #25974)