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Class 9 Chemistry · Chapter 6 · Test 4

Pressure and Equilibrium

25 MCQs covering the effect of pressure on gaseous equilibria including Le Chatelier’s principle and changes in gaseous mole numbers.

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

    Pressure changes affect equilibrium significantly when the reaction involves what type of substances?

    • ASolids only
    • BLiquids only
    • CGases
    • DSolids and liquids only
    Show answer

    Answer: C

    Gaseous equilibria can be affected by changes in pressure.

  2. Question 2

    When pressure is increased in a gaseous equilibrium the equilibrium shifts toward the side with what number of gas moles?

    • AMore gas moles
    • BFewer gas moles
    • CEqual gas moles
    • DNo gas moles
    Show answer

    Answer: B

    Increasing pressure favors the side containing fewer moles of gas.

  3. Question 3

    What happens to equilibrium when pressure is decreased in a gaseous reaction?

    • AIt shifts toward fewer gas moles
    • BIt shifts toward more gas moles
    • CIt always shifts forward
    • DIt always stops
    Show answer

    Answer: B

    Decreasing pressure favors the side containing more moles of gas.

  4. Question 4

    For N2(g) + 3H2(g) ⇌ 2NH3(g) how many moles of gas are present on the reactant side?

    • A2
    • B3
    • C4
    • D5
    Show answer

    Answer: C

    There are 1 mole of N2 and 3 moles of H2 giving a total of 4 moles of gas.

  5. Question 5

    For N2(g) + 3H2(g) ⇌ 2NH3(g) how many moles of gas are present on the product side?

    • A1
    • B2
    • C3
    • D4
    Show answer

    Answer: B

    The product side contains 2 moles of NH3 gas.

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