Waec Chemistry Past Questions For Year 1996
Question 11
A solution of pH 7 is
- A. acidic
- B. neutral
- C. concentrated
- D. dilute
- E. saturated
Question 12
What does X represent in the following equation? H 2(g) + 1/2O2(g) → H2O (l); ∆H = xKJ.
- A. Bond energy
- B. Activation energy
- C. Ionization energy
- D. Enthalpy of neutralization
- E. Enthalpy of formation
Question 13
The rate of production of hydrogen gas from the reaction between zinc granules and hydrochloric acid can be increased by
- A. cooling the reaction mixture
- B. using zinc powder instead of zinc granules
- C. using zinc rod instead of zinc granules
- D. carrying out the reaction at a higher pressure
- E. carrying out the reaction in a closed vessel
Question 14
Which of the following is not correct about a catalyst? It
- A. remains unchanged chemically at the end of a reaction
- B. helps to establish equilibrium faster reversible reaction
- C. can start a chemical rection which will normally not take place
- D. is usually specific in its action
- E. alters the rate of chemical reaction
Question 15
Which of the following statements is not correct about electrolysis?
- A. Reduction occurs at the anode
- B. Anions migrate to the anode
- C. Positive ions migrate to the cathode
- D. Concentration affects the discharge of ions
- E. Electrolytes conduct electric current
