Past Questions And Answers
Teacher, do you not care if we perish? Where was Jesus Christ when this question was asked?
- A) On the sea, walking
- B) In the wilderness
- C) On the Mount of Olive
- D) In the ship, asleep
(a)(i) State three characteristics of a homologous series.
(ii) Give the name and structural formula of the second member of the alkyne series.
(iii) Write an equation to represent the combustion of ethane in excess oxygen.
(b) Name the type of reaction involved in the conversion of ethanol to
(i) ethene;
(ii) ethylethanoate;
(iii) chloroethane;
(iv) ethoxide
(v) ethanoic acid
(c) Consider the following compound.
(i) Write its IUPAC name.
(ii) Give its molecular formula and empirical formula
(iii) List the products of its H H 0 reaction with saturated Na\(_2\)CO\(_3\) solution.
(iv) State with reason whether its boiling point will be higher or lower than that of the corresponding alkane.
(d) A vegetable oil X was treated with activated charcoal and then with a gas Y in the presence of a catalyst in order to manufacture
(i) Identify Y.
(ii) State the function of the activated charcoal.
(iii) What is the catalyst used?
(iv) If a sample of X is heated with concentrated sodium hydroxide solution, list the products that will be obtained.
.jpg)
A Secehi disc is used in the determination of
- A) rainfall
- B) tides
- C) waves
- D) turbidity
The value of money is generally measured in relation to the
- A. interest rate charged on the bank loans
- B. general price level
- C. size of a country's gold stock
- D. volume of imports
(a) (i) What is the structure of the atom as proposed by Rutherford?
(ii) Distinguish between the atomic number and the mass number of an element.
(iii) Explain briefly why the relative atomic mass of chlorine is not a whole number.
(b) (i) What is meant by first ionization energy?
(ii) List three properties of electrovalent compounds.
(iii) Consider the following pairs of elements: I. \(_9\)F and \(_{17}\)Cl; \(_{12}\)Mg and \(_{20}\)Ca. Explain briefly why the elements in each pair have similar chemical properties.
(c) Explain briefly the following terms using an appropriate example in each case.
(i) homologous series; (ii) heterolytic fission.
(d) State the indicator(s) which could be used to determine the end-point of the following titrations:
(i) dilute hydrochloric acid against sodium hydroxide solution;
(ii) dilute hydrochloric acid against ammonium hydroxide solution;
(iii) ethanoic acid against sodium hydroxide solution.
(e) A solid chloride E which sublimed on heating reacted with an alkali F to give a choking gas G. G turned moist red litmus paper blue. identify E, F and G.
View Discussion (0)WAEC 2012 THEORYSolve the simultaneous equations y=3x and 4y-5x =14
- A. (-2,-6)
- B. (2,-6)
- C. (2,6)
- D. (-2,6)
In sheep production, tapeworm could be controlled by
- A. dusting
- B. spraying
- C. dipping
- D. drenching
Letters, journals and diaries are examples of
- A. faction
- B. meta-fiction
- C. fiction
- D. non-fiction
Use the information below to answer this question. Timo and Chris are computer engineers who went into partnership as Teachi and Co. Timo brought cash of N12,000 furniture worth of N18,000 and vehicle worth of 70,000. Chris equally brought in cash of 10,000 his building valued at 105,000 and personal computers worth N35,000.
What is the profit sharing ratio if it’s based on capital contribution by Teechi and Co?
- A. 2 : 3
- B. 3 : 2
- C. 6 : 5
- D. 5 : 6
A community reaches a climax when
- A. only pioneer organisms are present
- B. new habitats are constantly being formed
- C. there is an introduction of new plants and animal species within the community
- D. the composition and size of a community remains constant over a long period