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Chemistry WAEC / WASSCE 2016 Stoichiometry, Mole Concept & Volumetric Analysis
(a) (i) Draw the structures of the isomers of the alkene with molecular formurat C\(_4\)H\(_8\) (ii) State the class of alkanols to which each of the following compounds belongs: I. CH\(_3\)C(CH\(_3\))\(_2\)OH; II. CH\(_3\)CH(CH\(_3\))CH\(_2\)OH; III. CH\(_3\)CH\(_2\)CH(CH\(_3\))OH. (b) (i) Write the formulae of the products formed in the following reactions: I. CH\(_3\)CH\(_2\)COOH \(\frac{K_{(s)}}{}\) II. CH\(_3\)CH\(_2\)COOH. \(\frac{C_4H_6OH, heat}{Conc.H_2SO_4}\) III. CH\(_3\)CH\(_2\)CH\(_2\)CH\(_2\)OH \(\frac{H^+/KMnO_4}{(excess)}\) (ii) Name the major product(s) of each of the reactions in (b)(i). (c) A gaseous hydrocarbon R of mass 7.0 g occupies a volume of 2.24 dm\(^3\) at s. t.p. If the percentage composition by mass of hydrogen is 14.3, determine its: (i) empirical formula; (ii) molecular formula. [ H = 1.00, C = 12.0, Molar volume of gas at s.t.p, = 22.4 dm\(^3\) ] (d) Define structural isomerism.
medium Difficulty
Chemistry WAEC / WASSCE 2016 Metals, Transition Elements & Extraction
(a)(i) Name a suitable drying agent for the preparation of carbon (IV) oxide in the laboratory. (ii) Using one chemical test, distinguish between carbon (II) oxide and carbon (IV) oxide. (b)(i) Describe briefly how oxygen and nitrogen could be obtained separately from air on an industrial scale (ii) State how a lighted splint can be used to distinguish between samples of oxygen and nitrogen. (c)(i) Give one reason why bauxite is usually preferred as the ore for the extraction of aluminium. (ii). List two main impurities. usually present in bauxite. (iii) State the function of sodium hydroxide solution in the extraction of aluminium from its ore. (iv) Explain briefly why it is difficult to extract aluminium by chemical reduction of aluminium oxide (v) Write an equation for the reaction of aluminium oxide with aqueous sodium hydroxide. (d) (i) The melting and boiling points of sodium chloride are 801 ^\circC and 141.3 ^\circC respectively. Explain briefly why sodium chloride does not conduct electricity at 25^\circC but does so between 801 ^\circC and 1413 ^\circC. (ii) State the reason why sodium metal is stored under paraffin oil in the laboratory. (e)(i) State what would be observed when aqueous sodium trioxocarbonate(IV) is added to a solution containing iron (III) ions (ii) Write a balanced equation for the reaction in (e)(i).
medium Difficulty
Chemistry WAEC / WASSCE 2016 Non-Metals & Their Compounds
(a)(i) Determine the oxidation number of sulphur in Na\(_2\)S\(_2\)O\(_3\) (ii) Name the allotropes of sulphur. (iii) State two ways in which the structure of graphite and diamond are similar. (b)(i) Name two green-house gases. (ii) State one effect of an increased level of green-house gases on the environment. (iii) State one source from which nitrogen (I) oxide is released into the environment. (iv) Write a chemical equation to show the effect of heat on each of the following compounds: I. KNO\(_{3(s)}\) II. AgNO\(_{3(s)}\) (C)(i)Describe briefly how pure crystals of calcium chloride could be obtained from a solution of calcium chloride ii) Explain briefly each of the following observations: I. ammonia gas is highly soluble in water; II. boiling ploint of chlorine is lower than that of iodine (d) Consider the reaction represented by the following equation:- 2NaCl + H\(_2\)SO\(_{4(s)}\) \(\to\) Na\(_2\)SO\(_{4(s)}\) + 2HCl\(_{(g)}\) Calculate the volume of HCl gas that can be obtained at s.t.p. from 5.85 g of sodium. chloride. [ Na = 23.0, Cl = 35.5, Molar volume of gas at s.t.p. = 22.4 dm\(^3\)]
medium Difficulty
Chemistry UTME / JAMB 2016 Kinetic Theory of Matter & Gas Laws
From the diagram above, an ideal gas can be represented by
A
K
B
M
C
L
D
N
medium Difficulty
Chemistry WAEC / WASSCE 2016 Stoichiometry, Mole Concept & Volumetric Analysis
All your burette readings (initials 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 booklet A solution of 0.050 moldm\(^3\) H\(_2\)C\(_2\)O\(_4\) (ethanedioic acid). B is a solution of KMnO\(_4\), (potassium tetraoxomanganate (VII), of unknown concentration. (a) Put B into the burette. Pipette 20.0 cm\(^3\) or 25.0 cm\(^3\) of A into a Conical flask and add about 10.0 cm\(^3\) of dilute H\(_2\)SO\(_4\), Heat the mixture to about 40^\circC - 50^\circC and titrate it while still hot with B. Repeat the titration to obtain consistent titre values. Tabulate your results and calculate the average volume of B used. The equation of reaction is; 2MnO\(_{4(aq)}^-\) + 5C\(_2\)O\(_{4(aq)}^{2-}\) + 16H\(^+_{(aq)}\) \(\to\) 2MnH\(^{2+}_{(aq)}\) + 8H\(_2\)O\(_{(l)}\) + 10CO\(_{2(g)}\) (b) From your results and the information provided, calculate the: (i) concentration of MnO\(_2^-\) in B in moldm\(^{-1}\) (ii) concentration of KMnO\(_4^-\) in B in gdm\(^{-3}\) (iii) volume of CO\(_2\) evolved at s.t.p when 25.0 cm\(^3\) of H\(_2\)C\(_2\)O\(_4\) reacted completely. [0 = 16.0, K= 39.0, Mn = 55.0, Molar volume of gas at s.t.p.= 22.4 dm\(^3\) mol\(^{-1}\)] Credit will be given for strict adherence to the instructions. for observations precisely recorded and jor accurate inferences. All tests, observations and inferences must be clearly entered in your answer book in ink, at the time they are made
A
Dihydric Alkanol
B
Tertiary Alkanol
C
Trihydric Alkanol
D
Monohydric Alkanol
medium Difficulty
Chemistry WAEC / WASSCE 2016 Nature of Matter & Separation Techniques
All your burette readings (initials 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 booklet (a) What difference in physical properties enable the separation of mixtures by: (i) simple distillation, (ii) paper chromatography; (iii) fractional distillation. (b) Give a reason for each of the following practices during titration in the laboratory. (i) White tile is placed under the conical flask. (ii) Burette readings are always recorded to two decimal places. (iii) Calculate the volume of 2.5 moldm\(^{-3}\) stock HČI required to prepare 500 cm\(^3\) of 0.20 moldm HCI.
medium Difficulty
Chemistry WAEC / WASSCE 2016 Nature of Matter & Separation Techniques
All your burette readings (initials 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 booklet C is a mıxture of two salts, containing one cation and two anions. 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 beaker and add about 10 cm\(^3\) of distilled water. Stir well and filter. Keep the filtrate and the residue. (b) To about 2 cm\(^3\) of the filtrate, add few drops of AgNO\(_{(aq)}\), followed by HNO\(_{3(g)}\). Add excess NH\(_{3(aq)}\) to the resulting mixture. (c)(i) Put all of the residue into a clean test tube and add about 5 cm of HNO\(_{3(aq)}\) (ii) To about 2 cm\(^3\) of the solution from 2(c)(i), add NaOH\(_{(aq)}\) in drops and then in excess (iii) To another 2 cm\(^3\) of the solution from 2(c)(i), add NH\(_{3(aq)}\) in drops and then in excess.
medium Difficulty
Chemistry WAEC / WASSCE 2016 Stoichiometry, Mole Concept & Volumetric Analysis
All your burette readings (initials 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 booklet A solution of 0.050 moldm\(^3\) H\(_2\)C\(_2\)O\(_4\) (ethanedioic acid). B is a solution of KMnO\(_4\), (potassium tetraoxomanganate (VII), of unknown concentration. (a) Put B into the burette. Pipette 20.0 cm\(^3\) or 25.0 cm\(^3\) of A into a Conical flask and add about 10.0 cm\(^3\) of dilute H\(_2\)SO\(_4\), Heat the mixture to about 40^\circC - 50^\circC and titrate it while still hot with B. Repeat the titration to obtain consistent titre values. Tabulate your results and calculate the average volume of B used. The equation of reaction is; 2MnO\(_{4(aq)}^-\) + 5C\(_2\)O\(_{4(aq)}^{2-}\) + 16H\(^+_{(aq)}\) \(\to\) 2MnH\(^{2+}_{(aq)}\) + 8H\(_2\)O\(_{(l)}\) + 10CO\(_{2(g)}\) (b) From your results and the information provided, calculate the: (i) concentration of MnO\(_2^-\) in B in moldm\(^{-1}\) (ii) concentration of KMnO\(_4^-\) in B in gdm\(^{-3}\) (iii) volume of CO\(_2\) evolved at s.t.p when 25.0 cm\(^3\) of H\(_2\)C\(_2\)O\(_4\) reacted completely. [0 = 16.0, K= 39.0, Mn = 55.0, Molar volume of gas at s.t.p.= 22.4 dm\(^3\) mol\(^{-1}\)] Credit will be given for strict adherence to the instructions. for observations precisely recorded and jor accurate inferences. All tests, observations and inferences must be clearly entered in your answer book in ink, at the time they are made
medium Difficulty
English Language UTME / JAMB 2016 Prescribed Literature Texts & Literary Appreciation
These questions are based on A.H. Mohammed's The Last Days at Forcados High School. At the end of term in Forcados High School. Nene was saddled with the responsibility of
A
leading her house in the race
B
packaging the gifts for presentation
C
arranging the school hall for dinner
D
organizing the carol night
medium Difficulty
English Language UTME / JAMB 2016 Prescribed Literature Texts & Literary Appreciation
Efua was not in the good books of teachers at Forcados High School because
A
the students of Forcados did not like her
B
she was expelled from her previous school
C
she bribed the principal before she was admitted
D
her admission into senior class was unusual
medium Difficulty
English Language UTME / JAMB 2016 Prescribed Literature Texts & Literary Appreciation
In the novel, Ansa looked around glumly when Jimi was engrossed in laughter and chatter because he was
A
neglected by Jimi
B
anxious to go home
C
distracted by a band playing on the field
D
given twelve strokes of the cane by the principal
medium Difficulty
English Language UTME / JAMB 2016 Prescribed Literature Texts & Literary Appreciation
Mama Shilifat had an affection for Jimi because she always gave him
A
money to buy chewing gum
B
advice against bad students
C
the courage to do well in his class
D
the largest pieces of puff-puff
medium Difficulty
English Language UTME / JAMB 2016 Prescribed Literature Texts & Literary Appreciation
Ansa licked his lips and said furtively, look this is between you and me. Jimi would be angry if i told you but his brother is ---- well, we suspect he sometimes sells drugs and...' From the excerpt above, Ansa was talking to
A
Risikat and Nene
B
Novi
C
Caro
D
Efua and Nene
medium Difficulty
English Language UTME / JAMB 2016 Prescribed Literature Texts & Literary Appreciation
The speculation amongst the students of Forcados High School was that Jimi was dating
A
Risikat
B
Joke
C
Caro
D
Efua
medium Difficulty
English Language UTME / JAMB 2016 Prescribed Literature Texts & Literary Appreciation
Mr Solade sent Jimi to Ibadan for the holidays in order to
A
save Jimi from Wole's bad influence
B
heed Jimi's request to stay with his friends
C
allow Jimi spend some time with his friends
D
allow Jimi to know more about Ibadan
medium Difficulty
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