1. Reaction that can proceed in both directions
What is a reversible reaction?
Forward Reaction
Reaction that has stopped
Reaction that can proceed in both directions
Reverse Reaction

2. Yellow Green Blue Orange
What colour will the equilibrium mixture if concentrated sulfuric acid is added to
Yellow
Green
Orange
Blue

4. Why is chemical equilibrium described as a dynamic state?
Reaction is completed
Reaction has stopped
Reaction has not stopped
No Reactants left

5. Explain the colour change observed on cooling the above reaction mixture if the forward reaction is endothermic.
Blue as equilibrium moves to right
Pink as equilibrium moves to left
Purple as equilibrium moves midway between left and right
Colourless as both coloured reactants react when mixture is cooled

6. Contact Process Which is the following is a reversible reaction
Burning of Magnesium
Contact Process
Addition of Sodium to Water
Addition of Zinc to Acid

7. Which of these statements is not true about Dynamic Equilibrium
Position of Equilibrium can be Changed
Equilibrium is always at half way point
Forward and backward reactions occur at same rate
Only reversible reactions reach dynamic equilibrium

8. What is the effect of a catalyst on a reversible reaction?
Increases yield of Reactants
Increases yield of Products
Lowers yield of Reactants
Lowers Activation Energy

9. Le Chatelier Bronsted Lowry Arnhenius
Name the scientist who investigated the affect of stress on a reversible reaction at equilibrium?
Fritz Haber
Le Chatelier
Bronsted Lowry
Arnhenius

10. Which of the following decreases the concentration of Nitrogen?
Decrease concentration of Hydrogen
Increase concentration of Ammonia
Increase pressure in reaction vessel
Increase temperature of reaction vessel

11. Temperature does not matter Excessive Temperature
Predict the levels of temperature needed to maximise the yield of ammonia when equilibrium is established.
Temperature does not matter
Excessive Temperature
Low Temperature
High Temperature

12. What is the name of the process involved in the oxidation of sulfur dioxide to sulfur trioxide
Reforming Process
Reduction Process
Contact Process
Haber Process

13. Change in Concentration of Reactants Change in Pressure
Which of the following does not affect position of Equilibrium
Change in Temperature
Addition of Catalyst
Change in Concentration of Reactants
Change in Pressure

14. Which of the following is false about a reaction at equilibrium
Temperature always increases rate of forward reaction
Direction of shift depends on sign of ∆H
Changing temperature affects rate of forward and backward reactions
Temperature changes Equilibrium Constant Value

15. Gets larger Becomes zero Gets smaller Does not change
State, if the red colour fades when the test tube containing the above equilibrium mixture is placed in an ice-water bath, how the value of Kc changes.
Gets smaller
Gets larger
Becomes zero
Does not change