Waec Chemistry Past Questions For Year 1992
Question 6
If the volume of a given mass of gas at 298 K and pressure of 205.2 x 10\(^3\) Nm\(^{-2}\) is 2.12dm\(^3\), what is volume of the gas at s.t.p? (Standard pressure = 101.3 x 10\(^3\) Nm\(^{-2}\), Standard temperature = 273K)
- A. 39.3dm 3
- B. 22.4dm3
- C. 4.93dm3
- D. 3.93dm3
- E. 0.393dm3
Question 7
Which of the following processes is a physical reaction?
- A. Electrolysis
- B. Hydrolysis
- C. Allotropic change
- D. Neutralization
- E. Corrosion
Question 8
Study carefully the reaction represented by the equation below. 2H2O 2(l) → O 2(g) + 2H2O(l). Which of the following will not reaction increase the reaction rate?
- A. Heating the hydrogen peroxide
- B. Adding a pinch of MnO2 to the reactant
- C. increasing the concentration of the H2O2
- D. Adding water to the reactant
- E. Exposing the reactant to sunlight
Question 9
''The rate a reaction is proportional to the number of effective collisions occurring per second between the reactants''. This statement is associated with the
- A. Kinetic theory
- B. rate law
- C. atomic theory
- D. collision theory
- E. gas laws
Question 10
What is the quantity of electricity produced when a current of 0.5A is passed for 5 hours 45 mins? (1F = 96500C)
- A. 0. 11F
- B. 0.12F
- C. 0.22F
- D. 1.1F
- E. 2.2F