WAEC Chemistry Past Questions, Answers, And Explanations - Chemistry

Waec Chemistry Questions

Question 1101:

Consider the following reaction equation: X_(g)
+ Y_(g) â‡Œ XY_(g); âˆ†H = + 220KJ mol^-1 If the temperature of the system is increased, the

Question 1102:

What is the value of n in the following equation? Cr₂O₇^2- + 14H⁺ + ne^- â†’ 2Cr ³⁺ + 7H₂O

Question 1103:

What mass of copper would be formed when a current of 10.0 A is passed through a solution of CuSO₄ for 1 hour? [Cu = 63.5; 1F = 96500C]

Question 1104:

Which of the following metals could be used as sacrifical anode for preventing the corrosion of iron?

Question 1105:

Consider the following electrochemical cell notation: M_(s) / M²⁺_(aq)// H⁺_(aq)/ H_2(g). The value of the electrode potential is positive when

A Electrons flow from the metal electrode, M_(s) to hydrogen electrode, H_2(g)
B Electrons fow from hydrogen electrode, H_2(g) to metal electrode, M_(s)
C The flow of current is high
D There is equilibrium between the flow of electrons from the hydrogen electrode, H_2(g) to metal electrode, M_(s)