3. 5 mL of BaCl2(aq) solution are added to 5 mL of K2CrO4(aq) solution. What will you
observe?
(a) The solution will become more yellow
(b) The solution will remain unchanged
(c) The solution will become more orange
(d) A precipitate will form
__________
4. HCl(aq) is added to the solution in question 3. What will you observe?
(a) The solution above the precipitate will become colourless
(b) Some or all of the precipitate will dissolve
(c) Nothing will happen
(d) More precipitate will form
__________
5. The following system was found to be red at room temperature, but on cooling It
turned colourless:
A + B ⇄ C + D
red colourless
Which of the following statements (if any) is true regarding this equilibrium?
(a) Heat is required to make the forward reaction go.
(b) The forward reaction is endothermic.
(c) The forward reaction is exothermic.
(d) The forward reaction works only at higher temperatures.
(e) None of the above.