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Class 9 Chemistry · Chapter 6 · Test 3

Temperature and Equilibrium

25 MCQs covering the effect of temperature on reversible reactions, exothermic and endothermic directions, equilibrium shifts, and ammonia formation.

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 happens to the state of equilibrium when the temperature of a reversible reaction is changed?

    • AIt may be disturbed
    • BIt always remains unchanged
    • CIt stops permanently
    • DIt becomes irreversible
    Show answer

    Answer: A

    Changing the temperature can disturb an established equilibrium.

  2. Question 2

    For the reaction N₂ + 3H₂ ⇌ 2NH₃ the forward reaction is:

    • AExothermic
    • BEndothermic
    • CNeither exothermic nor endothermic
    • DAlways neutral
    Show answer

    Answer: A

    The formation of ammonia in this reaction is exothermic according to the chapter.

  3. Question 3

    What is the effect of increasing temperature on an exothermic forward reaction?

    • AThe equilibrium is driven in the reverse direction
    • BThe equilibrium is driven in the forward direction
    • CThe reaction stops
    • DThe catalyst is removed
    Show answer

    Answer: A

    Increasing temperature favours the endothermic direction which is the reverse direction for an exothermic forward reaction.

  4. Question 4

    What is the effect of decreasing temperature on an exothermic forward reaction?

    • AThe forward reaction is favoured
    • BThe reverse reaction is favoured
    • CNo reaction occurs
    • DThe equilibrium disappears
    Show answer

    Answer: A

    Lowering temperature favours the exothermic direction which is the forward direction in this reaction.

  5. Question 5

    If the forward reaction is exothermic what is the reverse reaction?

    • AEndothermic
    • BExothermic
    • CNeither
    • DAlways neutral
    Show answer

    Answer: A

    If the forward direction releases heat the reverse direction absorbs heat and is endothermic.

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