Past Questions And Answers
(a)(i) Outline a suitable procedure for the preparation of ZnCl\(_2\) crystals stating from zinc granules.
(ii) Write a balanced equation for the reaction in (a)(i).
(b) Considei' the following solutions: Na\(_2\)SO\(_{4(aq)}\), CH3COOK\(_{(aq)}\), Pb(NO\(_3\))\(_{2(aq)}\) and MgCl\(_2\). Which of them has/have a pH
(i) greater than 7;
(ii) equal to 7;
(iii) less than 7?
(c)(i) Determine the oxidation number of Mn in I. MnO\(_2\); II. KMnO\(_4\).
(ii) State one laboratory use of each of the .compounds in (c)(i).
(d) Explain why oxidation and reduction processes are complementary.
(e) Consider the reaction represented by the equation: Fe\(_{(s)}\) + 2Ag\(^+_{(aq)}\) \(\to\) Fe\(^{2+}_{(aq)}\) + 2Ag\(_{(s)}\)
(i) Write a balanced ionic half equations for the reaction.
(ii) Which of the species is I. oxidized; II. reduced?
(iii) State the change in the oxidation number of silver during the reaction.
View Discussion (0)WAEC 2009 THEORYThis question is based on Mariama Ba's So Long a Letter
'....One is a mother to shield when lightning streaks the night, when thunder shakes the earth, when mud bogs knock one down. One is a mother in order to love without beginning or end.'
On what occasion do these lines occur in the novel?
- A. At the burial ceremony of Ramatoulaye's husband
- B. After the confession of Ramatoulaye's daughter, that she was pregnant
- C. When Ramatoulaye was learning to drive the Flat 125
- D. When Ramatoulaye saw her mother sick in bed
prophet muhammed (SAW) left Taif because
- A. Jews outnumbered the muslims
- B. People were not interested in his message
- C. Yahribithes had recalled him to their city
- D. early muslims had returned to Makkah
Which of the following statements about enzymes is true?
- A. Enzymes will work at any pH value.
- B. Enzymes are lipids.
- C. Enzymes work best only at certain temperatures.
- D. Enzymes are useful for slowing down reactions in living things.
a[¡] Draw a sketch map of Nigeria. On the map, locate and name:
the Sudan savanna belt.
[¡¡] Draw a sketch map of Nigeria. On the map, locate and name:
the Tropical rainforest belt.
[¡¡¡] Draw a sketch map of Nigeria. On the map, locate and name:
one town in 5(a)(ii).
b. Identify four characteristics of the Tropical rainforest in Nigeria.
c. Outline five economic importance of the Tropical rainforest to Nigeria
View Discussion (0)WAEC 2023 THEORY
This question is based on selected poems from D. Ker, C. Maduka et al (eds.): New Poetry from Africa, Wole Soyinka (ed.): Poems of Black Africa, K.E. Senanu and T. Vincent (eds.): A Selection of African poetry and E.W. Parker (ed.) A Pageant of Longer Poems.
Wordsworth's 'The Solitary Reaper' is preoccupied with the
- A. relieveing effect of the song on the reaper's
- B. enduring impact of the reaper's song
- C. sweetest human voice of the poet ever heard
- D. similarity between the voice of the reaper and the cuckoo-bird
Find the derivatives of (2 + 3x)(1 - x) with respect to x
- A. 6
- B. -3
- C. 1 - 6x
- D. 6x - 1
A measure of national income used as comparison of standard of living among nations is
- A. net national product
- B. gross domestic product
- C. gross national product
- D. per capita income
In the sentence below, there is one underlined word and one gap. From the list of words lettered A to D, choose the one that is most nearly opposite in meaning to the underlined word and that will, at the same time correctly fill the gap in the sentence.
Lions are inextinction in The Gambia but monkeys are still in .......
- A. action
- B. existence
- C. vogue
- D. custody
Jesus had compassion for the five thousand people fed by Him because they were
- A. hungry but had no time to eat
- B. like sheep without a shepherd
- C. strangers from the country and villages far away
- D. poor and had no money to buy food