Past Questions And Answers
New Zealand is a breed of which animal?
- A. Goat
- B. Cattle
- C. Rat
- D. Rabbit
The hormone which regulates the amount of sugar in the blood is
- A) Thyroxine
- B) Auxin
- C) Insulin
- D) Adrenalin
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 government has decided that,from next year military service will no longer becompulsory: it will be........................
- A. free
- B. optional
- C. open
- D. conditional
Liming is used to correct soil's
- A. neutrality
- B. acidity
- C. cation exchange capacity
- D. porosity
Choose a word which has the same or nearly the same meaning as the first word. Dear:
- A. precious
- B. cheap
- C. nice
- D. useless
(i) Draw and label an energy profile diagram of an endothermic reaction. Indicate on your diagram the I. activation energy II. heat change, \(\Delta\)H.
(ii) Explain how the rate of reaction is affected by I. addition of a catalyst, II. increase in temperature.
(b)(i) Write an equation for the thermal decomposition of calcium trioxocarbonate (IV)
(ii) Determine the volume of carbon (IV) oxide measured at s.t.p. that would he produced by the thermal decomposition of 10g calcium trioxocarbonate (IV). [ Ca = 40; O = 16; C = 12 ]
(c)(i) Give one use cf each of the following forms of carbon: I. coal; II. wood charcoal; Ill. carbon (IV) oxide.
(ii) Write a balanced chemical equation to show what happens when each of the following compounds is heated strongly: I. NaNO\(_{3(s)}\) II. MgCO\(_{3(s)}\).
(d) Consider the following compounds: CaO, CaCO\(_3\), Ca(OH)\(_2\), NaOH Which of them is
(i) used in the manufacture of cement;
(ii) used to detect the presence of carbon (IV) oxide;
(iii) used to liberate carbon (IV) oxide when dilute acid is added;
(iv) hygroscopic;
(v) deliquescent?
View Discussion (0)WAEC 2007 THEORYP(-6, 1) and Q(6, 6) are the two ends of the diameter of a given circle. Calculate the radius.
- A. 6.5 units
- B. 13.0 units
- C. 3.5 units
- D. 7.0 units
Night blindness in an animal is caused by a deficiency of
- A. vitamin A
- B. calcium
- C. vitamin B
- D. phosphurous
The alkyl group is represented by the general formula
- A) CnH2n
- B) CnH2n − 2
- C) CnH2n + 1
- D) CnH2n + 2
What are the factors with which commercial undertaking can be distinguish? I Size of the undertaking II Profits generated III Forms of ownership IV Location of the undertaking
- A. I and II only
- B. I and III only
- C. II and III only
- D. III and IV only