Past Questions And Answers
(a)(i) State three postulates of the kinetic theory of gases.
(ii) Draw a sketch to illustrate Boyle's law.
(iii) Explain what is meant by "absolute zero of temperature".
(b) Equal volumes of a gas X and oxygen are at the same pressure but temperature of 200 K and 800K respectively.
(i) Giving reason for your answer, state which of the gas samples contains the greater number of molecules.
(ii) If the mass of one molecule of the gas X is 2.19 x 10\(^{-22}\) g, determine the molar mass of X. [Avogadro constant = 6.02 x 10\(^{-23}\)]
(iii) Hence, state with reason which of X and oxygen will diffuse faster under the same conditions. [O= 16].
(c)(i) Mention two reaction conditions that can increase the yield of ammonia in the reaction represented by the following equation: N\(_{2(g)}\) + 3H\(_{2(9)}\) \(\rightleftharpoons\) 2NH\(_{3(g)}\) \(\Dellta\)H = -46kJmol\(^{-1}\). Draw a labelled energy profile diagram for an endothermic reaction.
(iii) A solid W decomposes on heating according to the following equation: W\(_{(s)} \to Y_{(s}) + Z_{(g)}\) List two factors apart from temperature, which can affect the rate of the reaction.
View Discussion (0)WAEC 1999 THEORYFill in the gap with the option that best completes the sentence.
The secretary and treasurer did not do ____ job.
- A. their
- B. all of the above
- C. none of the above
- D. his
A situation in which a commodity is sold abroad below its cost of production in the home country is known as?
- A. dumping
- B. counter trade
- C. bilateral trade
- D. trade liberalization
the actual output of an economy is the output
- A. which would exist if all resources were fully employed
- B. produced by currently employed labour capital and land
- C. produced in the consumer goods sector
- D. produced in the capital goods sector
This question is based on William Shakespeare's Hamlet.
The king who is poisoned in the Garden in the play-within-the-play is
- A. Gozango
- B. Negtine
- C. Bernardo
- D. Hamlet
The colours seen on soap bubbles are due to
- A. Diffraction
- B. Refraction
- C. Dispersion
- D. Interference
In the question below, choose the expression or words whichbest completeseach sentence: He acts ..... he were a manager
- A. like
- B. such as
- C. such
- D. as if
The divine attribute of omnipotence is implied in
- A. as Sami
- B. al Bashir
- C. al Qadir
- C. al Alim
In the question below choose the word or phrase whichbest fills the gap in each sentence: On the orders of the steward, the cook rushed .... the market
- A. to
- B. at
- C. for
- D. in
A fog is most likely to develop when a
- A. warm moist wind blows over a warm current
- B. warm moist wind blows over a cold current
- C. cold, dry winds blows over a warm current
- D. warm, dry winds blows over a cold current