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Chemistry WAEC / WASSCE 1989 Stoichiometry, Mole Concept & Volumetric Analysis
The following are s-block elements except
A
lithium
B
magnesium
C
potassium
D
calcium
E
aluminium
medium Difficulty
Chemistry WAEC / WASSCE 1989 Metals, Transition Elements & Extraction
Which of the following statements is not true of tin? it
A
is a p-block element
B
is extracted from cassiterite SnO 2
C
is used for protecting iron containers from corrosion
D
combines with copper to form the alloy brass
E
shows two oxidation states, + 2 and + 4 in most of its compounds
medium Difficulty
Chemistry WAEC / WASSCE 1989 Periodic Table & Periodicity
The electronic configuration of two atoms X and Y are as follows: X - 1s 2 2s 22p 63s 1, Y -1s 22s 22p 63s23p 64s 2 which of the statements below is true of the position of X and Y in the Periodic Table?
A
x belongs to group 1, Y belongs to period 2,
B
x belongs to group 1, Y belongs to period 4
C
x belongs to group 2, Y belongs to period 1
D
x belongs to group 3, Y belongs to period 2
E
x belongs to group 3, Y belongs to period 4
medium Difficulty
Chemistry WAEC / WASSCE 1989 Chemical Energetics & Thermochemistry
Which of the following is a condition for a spontaneous reaction?
A
∆H -T is zero
B
∆H-T∆ S is positive
C
∆H-T∆ S is negative
D
∆S is zero
E
∆S is positive
medium Difficulty
Chemistry WAEC / WASSCE 1989 Stoichiometry, Mole Concept & Volumetric Analysis
50cm\(^3\) of a saturated solution of potassium trioxonitrate (V)at 40^\circC contains 5.05g of the salt. What is the solubility of potassium trioxonitrate (V) at 40^\circC? (KNO\(_3\) = 101)
A
1.0 mol dm-3
B
1.5 mol dm-3
C
2.0 mol dm-3
D
2.5mol dm-3
E
5.0mol dm-3
medium Difficulty
Chemistry WAEC / WASSCE 1989 Oxidation, Reduction & Redox Reactions
The oxidation number of chlorine is + 1 in
A
KCIO 3
B
CI 2O 7
C
ZnCI2
D
HCI
E
NaCIO
medium Difficulty
Chemistry WAEC / WASSCE 1989 Oxidation, Reduction & Redox Reactions
What is the voltage of the cell represented at Zn(s)/ Zn\(^{2+}\)(aq) //Cu\(^{2+}\)(aq) /Cu(s) given that for Cu\(^{2+}\)(aq)/ Cu (s) E\(^0\) = 0.337V and for Zn\(^{2+}\)(aq) /Zn(s)' E\(^0\) = - 0.763V?
A
+0.426V
B
-0.426V
C
-0.337V
D
-1.10V
E
+1.10V
medium Difficulty
Chemistry UTME / JAMB 1989 Chemical Energetics & Thermochemistry
CO(g) + H\(_2\)O(g) \(\to\) \(CO_{2g}\) + H\(_2\)(g) \(\Delta\)H = - 4100J. Which of the following factors favour the formation of hydrogen in the above reaction? i. high pressure. ii. low pressure iii. high-temperature iv. use of excess steam
A
i, iii and iv
B
iii only
C
ii, iii and i
D
iv only
medium Difficulty
Chemistry WAEC / WASSCE 1989 Stoichiometry, Mole Concept & Volumetric Analysis
(a) A mixture consist of sodium chloride, ammonium chloride and lead (II) tetraoxosulphate (VI). Describe how you would obtain each component in a pure state. (b) You are required to determine the concentration of a solution of tetraoxosulphate (VI) acid by titrating it against sodium trioxocarbonate (IV) solution of known concentration. (i) Name the indicator you would use (ii) List two precautions you would take to ensure accurate readins (iii) State the colour of the sodium trioxocarbonate (IV) solution after adding the named indicator and then at the end point.
A
+0.426V
B
-0.426V
C
-0.337V
D
-1.10V
E
+1.10V
medium Difficulty
Chemistry UTME / JAMB 1989 Chemical Energetics & Thermochemistry
CO(g) + H\(_2\)O(g) \(\to\) \(CO_{2g}\) + H\(_2\)(g) \(\Delta\)H = - 4100J. Which of the following factors favour the formation of hydrogen in the above reaction? i. high pressure. ii. low pressure iii. high-temperature iv. use of excess steam
A
i, iii and iv
B
iii only
C
ii, iii and i
D
iv only
medium Difficulty
Chemistry WAEC / WASSCE 1989 Organic Chemistry II: Functional Groups, Polymers & Biomolecules
(a) Write the chemical equation for the formation of named alkanoate. (b)(i) What are the monomers of protein called? (ii) Write the two functional groups present in the monomers named in (b)(i) above (iii) State the type of reaction that leads to the formation of proteins from their monomers.
medium Difficulty
Chemistry WAEC / WASSCE 1989 Water, Solutions & Solubility
(a) When is a sample of water said to be hard? (b) State one difference between temporary and permanent hardness of water (c) Give one method of removing hardness completely from water (d) Name two local is used for the production of soap.
medium Difficulty
Chemistry WAEC / WASSCE 1989 Non-Metals & Their Compounds
(a) Give one physical property of (i) diamond; (ii) graphite (b) Give two uses of diamond (c) evidence that shows that both graphite and diamond are allotropes of carbon.
medium Difficulty
Chemistry WAEC / WASSCE 1989 Stoichiometry, Mole Concept & Volumetric Analysis
(a) Give two characteristic features of boiling (b) What will be the effect of the following on the boiling point of water: (i) addition of crystals of sodium chloride, (ii) reduction of the atmospheric pressure? (c) State two ways in which boiling differs from evaporation.
medium Difficulty
Chemistry WAEC / WASSCE 1989 Oxidation, Reduction & Redox Reactions
(a) Write the formula of the oxide of nitrogen in which nitrogen has oxidation number of (i) +1; (ii) +2; (iii) +3; (iv) +4; (b) State which of the oxides in (a) above is/are: (i) acidic (ii) neutral.
medium Difficulty
Page 1741 of 1989