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- 1. Multiple Choice
Which reaction is reversible?
Cu + ZnSO4 → CuSO4 + Zn
CuO + H2SO4 → CuSO4 + H2O
CuO + H2 → Cu + H2O
CuSO4.5H2O → CuSO4 + 5H2O
- 2. Multiple Choice
Which reaction is not a reversible reaction?
combustion of fuel
hydration of anhydrous copper(II) sulfate
melting lead(II) bromide
thermal decomposition of hydrated cobalt(II) chloride
- 3. Multiple Choice
The diagram shows the change from an anhydrous salt to its hydrated form.Which statement is correct?
forward reaction requires heat and water
forward reaction requires water only
reverse reaction requires heat and water
reverse reaction requires water only
- 4. Multiple Choice
The equation shows a reaction that is reversed by changing the conditions. How can the forward reaction be reversed?
by adding water and then heating
by adding water
by heating
none of them
- 5. Multiple Choice
When hydrated green iron(II) sulfate is heated, it turns white and a colourless liquid is produced. When the liquid is put back into the white solid it changes back to green. What type of reaction takes place and what is the name of the liquid?
redox/ sulfuric acid
redox/ water
reversible/ sulfuric acid
reversible/ water
- 6. Multiple Choice
Heating pink cobalt(II) chloride crystals forms a blue solid and steam. The blue solid turns pink when water is added. Which terms describe the pink cobalt(II) chloride and the reaction?
anhydrous and reversible
anhydrous and irreversible
hydrated and reversible
hydrated and irreversible
- 7. Multiple Choice
The reversible sign is used in some equations to show that a reaction is reversible. Two incomplete equations are given. For which of these reactions reversible sign be correctly used to complete the equation?
P & Q
P only
Q only
neither P or Q
- 8. Multiple Choice
The equation for the effect of heat on hydrated sodium carbonate is as shown.
Statements made by four students about the reaction are given.
P- Anhydrous sodium carbonate is formed.
Q- Steam is formed.
R- There is a colour change from blue to white.
S- The reaction is reversible.
Which students’ statements are correct?
P, Q and R only
P, Q and S only
Q, R and S only
P, Q, R and S
- 9. Multiple Choice
When pink crystals of cobalt(II) chloride are heated, steam is given off and the colour of the solid changes to blue.
What happens when water is added to the blue solid?
changes to pink and temperature decreases
changes to pink and temperature increases
remains blue and temperature decreases
remains blue and temperature increases
- 10. Multiple Choice
When blue copper(II) sulfate is heated, a white solid and water are formed. The white solid turns blue and gives out heat when water is added to it. Which terms describe the blue copper(II) sulfate and the reactions?
the blue copper(II) sulfate is a mixture and reaction can be reversed
the blue copper(II) sulfate is a mixture and reaction cannot be reversed
the blue copper(II) sulfate is hydrated and reaction can be reversed
the blue copper(II) sulfate is hydrated and reaction cannot be reversed
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