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Class 9 Chemistry · Chapter 6 · Test 7

Driving Reactions to Completion

25 MCQs covering removal of products and other methods of driving reversible reactions toward completion.

MCQs

25 questions · 20 min · 25 marks

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Sample questions

The first 5 of 25. Try each one, then tap to see the answer.

  1. Question 1

    What can help drive a reversible reaction toward completion?

    • AAdding a product
    • BRemoving a product
    • CAdding an inert solid
    • DStopping the reaction
    Show answer

    Answer: B

    Removing a product disturbs equilibrium and causes more reactants to form products.

  2. Question 2

    What happens when a product is continuously removed from a reversible reaction?

    • AThe reverse reaction becomes impossible
    • BMore product is formed
    • CThe reaction stops
    • DReactants disappear instantly
    Show answer

    Answer: B

    Removing product causes the system to form more product to restore equilibrium.

  3. Question 3

    In CaCO3(s) ⇌ CaO(s) + CO2(g) how can the formation of CaO be increased?

    • AKeep CO2 in the vessel
    • BRemove CO2
    • CAdd more CO2
    • DLower the amount of CaCO3
    Show answer

    Answer: B

    Removing carbon dioxide drives the equilibrium toward CaO and CO2.

  4. Question 4

    Why does removing CO2 drive CaCO3(s) ⇌ CaO(s) + CO2(g) forward?

    • AThe concentration of a product is reduced
    • BThe concentration of CaCO3 is increased
    • CThe temperature becomes zero
    • DThe catalyst is removed
    Show answer

    Answer: A

    Removing a product causes the equilibrium to shift toward the product side.

  5. Question 5

    What happens when a gaseous product escapes from an open reaction vessel?

    • AThe reverse reaction is favored
    • BThe forward reaction is encouraged
    • CEquilibrium becomes impossible
    • DThe reactants become products instantly
    Show answer

    Answer: B

    Loss of a gaseous product shifts the reversible reaction toward further product formation.

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