Past Questions And Answers
(a) (i) State three characteristic properties of transition metals.
(ii) What is the oxidation state of manganese In each of the following species? (1) MnCl\(_2\) (II) MnO\(_2\) (III) MnO\(_4^{-}\)
(iii) Explain why manganese conducts electricity in the solid state but manganese chloride conducts only when molten or in solution.
(b)(i) The collision theory suggests that for two particles to react, they must collide. What two factors determine whether or not the collision would lead to formation of products?
(ii) Use an energy profile diagram to illustrate what is meant by the enthalpy change (\(\Delta\)H) and the activation energy (E\(_A\)) of a reaction.
(c) When few drops of aqueous KSCN are added to a solution of iron (III) salt the following equilibrium is set up:
Fe\(^{3}_{(aq)}\) + 3SCN\(^{-}_{(aq)}\) \(\rightleftharpoons\) Fe(SCN)\(_{3(aq)}\)
yellow colourless deep red
The equilibrium mixture has a pale red colour.
(i) Explain what would happen if more KSCN\(_{(aq)}\) were added to the equilibrium mixture.
(ii) Which of the ions in the equilibrium mixture forms an insoluble hydroxide with NaOH\(_{(aq)}\)? Write an equation for the reaction
(iii) State two changes observed on adding NaOH\(_{(aq)}\) to the equilibrium mixture.
View Discussion (0)WAEC 2003 THEORYPolitical party stalwart is the same as
- a. political supporters
- b. political opponents
- c. political enemies
- d. politicians
Which of the following is not a feature of federal constitution?
- A. division of power
- B. supremacy of the constitution
- C. flexibility of the constitution
- D. written constitution
The electoral success of political party depends on its ability to
- A. rig election successfully
- B. campaign till election day
- C. distribute sufficient funds to voters
- D. present a good and acceptable manifesto
A note of frequency of 2000Hz has a velocity of \(400ms^{-1}\). What is the wavelength of the note?
- A. 800m
- B. 200m
- C. 5m
- D. 0.2m
Which of the following is not a characteristic of a good pasture?
- A. high palatability
- B. high nutritive value
- C. high digestibility
- D. low leaf to stem ration
'Your brother will rise again, 'Jesus made this statement at Bethany in the house of
- A. Mary Magdalene and Martha
- B. Martha and Mary
- C. Elizabeth and Salome
- D. Martha and Joanna
Identify the various ways by which the traditional rulers controlled their subjects in pre-colonial West Africa
View Discussion (0)WAEC 1993 THEORYIn each of the following sentences, there is one word underlined and one gap. From the list of words lettered A - D, choose the word that is most nearly opposite in meaning to the underlined word and that will, at the same time, correctly fill the gap in the sentences.
Some people live in abjectpoverty while others live in ..............
- A. affluence
- B. greatness
- C. fame
- D. peace
In each of the following sentences, there is one word underlined and one gap. From the list of words lettered A - D, choose the word that is most nearly opposite in meaning to the underlined word and that will, at the same time, correctly fill the gap in the sentences.
The workers expected management to be...........rather thanindifferent to, their welfare.
- A. different from
- B. interested in
- C. opposed to
- D. careful of