Question Library — KalmiPrep by Kalmitech

Chemistry WAEC / WASSCE 2003 Non-Metals & Their Compounds

(a) State the role of each of the following substances in the treatment of river water for town supply (i) Sand bed. (ii) Alum (iii) Chlorine (b)(i) Give three major uses of H\(_2\)SO\(_4\) (ii) Explain the following observation: A strip of blue litmus paper dropped into concentrated H\(_2\)SO\(_4\) becomes charred whereas in dilute H\(_2\)SO\(_4\), it turns red and is not charred. (iii) Write an equation to show how concentrated H\(_2\)SO\(_4\) reacts with zinc. (c)(i) List two gaseous pollutants that can be generated by burning coal. (ii) Explain why coal burns more easily when it is broken into pieces than when it is in lump form. (ii) What gas is responsible for most of the explosions in coal mines? (iv) Name: the non-volatile residue left behind after the destructive distlillation of coal (d)(i) What is meant by allotropy? (ii) Name two crystalline allotropes of carbon (iii) Name two elements apart from carbon, which exhibit allotropy (iv) It is now known that carbon has an allotropic form called fullerene, containing molecules of formula C\(_{60}\). Calculate the mass of one mole of these molecules [C = 12]

medium Difficulty

Chemistry NECO SSCE 2003 Stoichiometry, Mole Concept & Volumetric Analysis

What is the number of moles of Na\(_H\)CO\(_3\) in 250cm\(^3\) of its solution if the solution contains 8.4 g of Na\(_H\)CO\(_3\) in 1 dm\(^3\) of the solution. [Na = 23, 0 = 16, C = 12, H = 1)

A

1

B

0.25

C

0.05

D

0.025

E

0.01

medium Difficulty

Chemistry WAEC / WASSCE 2003 Stoichiometry, Mole Concept & Volumetric Analysis

All your burette readings (initial and final), as well as the size of your pipette, must be recorded but no account of experimental procedure is required. All calculations must be done in your answer book. A is a solution of HCl containing 7.30g dm\(^{-3}\), B is a solution of X\(_2\)C\(O_3\) containing 10.6 gdm\(^{-3}\) (i) Put A into your burette and titrate readings against 20.0 cm\(^3\) or 25.0cm\(^3\) portions of B using methyl orange as indicator. Tabulate your burette reading and calculate the average volume of A used. The equation for the reaction involved in the titration is ; X\(_2\)CO\(_{3(aq)}\) + 2HCl\(_{(aq)}\) \(\to\) 2XCl\(_{(aq)}\) + H\(_2\)O\(_{(l)}\) + CO\(_{2(g)}\) (ii) From your results and the information provided above, calculate the (i) concentration or A in mol dm\(^{3-}\)

medium Difficulty

Chemistry WAEC / WASSCE 2003 Acids, Bases, pH & Salts

Credit will be given for strict adherence to instructions, for observations precisely recorded, and for accurate interference. 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 aqueous solutions of simple salt and an inorganic compound respectively. Carry out the following exercises on C and D. Record your observations and identify the gasses evolved. State the conclusion and draw from the result in the test and add sodium hydroxide in excess. (b)(i) Test D with litmus paper (ii) Put about 5cm\(^3\) of D in a test tube and add sodium hydroxide solution in drops and then in excess (iii) Add about 1cm\(^3\) of the soap solution provided to about 10 cm\(^3\) of D mixture. Repeat the test using distilled water in place D

medium Difficulty

Chemistry WAEC / WASSCE 2003 Nature of Matter & Separation Techniques

State what you would see on; (i) bubbling SO\(_2\) into acidified KMnO\(_4\) solution (ii) mixing zinc dust with CuSO\(_4\) solution (iii) adding concentrated HNO\(_3\) to freshly prepared FeSO\(_4\) solution. (b) List two substances in case which, if added to dilute H\(_2\)SO\(_4\), would give you (i) H\(_{2(g)}\) (ii) ZnSO\(_{4(aq)}\) (c) The diagram labeled I to IV ABOVE illustrate different laboratory set-ups used in the separation of mixtures. (i) Name the separation technique illustrated by each diagram (ii) Which of the set-ups is used for concentrating dilute salt solutions, for the purpose of crystallization? (iii) Which of the set-ups is used in obtaining clear water from muddy water? (iv) Mention the set-up you would use to separate a polar solvent from a non-polar solvent (v) State the modification you would make to the set-up labelled IV in order to use it for separating a mixture of NaCl and NH\(_4\)CI

Attached Figure / Diagram

medium Difficulty

English Language UTME / JAMB 2003 Reading Comprehension, Summary & Composition

The word debutants, as used in the passage, means

A

first -timers

B

giant killers

C

hard-fighters

D

under-dogs

medium Difficulty

English Language NECO SSCE 2003 Oral English: Vowel & Consonant Sounds

Choose from the options lettered A to E, the one that contains the sound segment represented by the given phonetic symbol. /θ/

A

text

B

that

C

they

D

thing

E

there

medium Difficulty

English Language NECO SSCE 2003 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

fumble

B

cushion

C

whisper

D

eclipse

E

custom

medium Difficulty

English Language NECO SSCE 2003 Concord (Subject-Verb Agreement)

From the options lettered A to E, choose the one that BEST COMPLETES each of the following sentences. Although l am watching television, l_________ you are saying

A

am hears what

B

can hear what

C

does hear all that

D

have heard everything

E

was hearing all the things

medium Difficulty

English Language NECO SSCE 2003 Concord (Subject-Verb Agreement)

From the options lettered A to E, choose the one that BEST COMPLETES each of the following sentences. This is the kind of soft drink______________

A

l do not like the taste of which

B

of which taste I do not like

C

the taste of which l do not like

D

which its taste l do not like

E

whose i do not like the taste of it

medium Difficulty

English Language NECO SSCE 2003 Concord (Subject-Verb Agreement)

From the words lettered A to E, choose the one that BEST COMPLETES each of the following sentences. Cigarette .......... has been banned.

A

Advertising

B

campaign

C

discussion

D

encouragement

E

publicity

medium Difficulty

English Language NECO SSCE 2003 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. lesson B. blessing C. service D. reason E. replace

A

B

D

C

A

D

C

E

medium Difficulty

English Language NECO SSCE 2003 Oral English: Vowel & Consonant Sounds

Choose from the options lettered A to E, the one that contains the sound segment represented by the given phonetic symbol. /l:/

A

bearing

B

beat

C

beauty

D

bit

E

lie

medium Difficulty

English Language NECO SSCE 2003 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). first

A

thirst

B

vest

C

will

D

wire

E

wiry

medium Difficulty

English Language NECO SSCE 2003 Concord (Subject-Verb Agreement)

From the options lettered A to E, choose the one that BEST COMPLETES each of the following sentences. The magistrate had hardly finished pronouncing his judgement_______ the accused collapsed.

A

As

B

and

C

instead

D

when

E

while

medium Difficulty