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  • Question 1
    1 / -0

    Which of the following changes can be reversed?

  • Question 2
    1 / -0

    Which of the following statements about redox reactions is/are correct?

    (i) A substance is said to be reduced if it gains oxygen during a reaction.
    (ii) A substance is said to be oxidised if it gains electrons during a reaction.
    (iii) A substance is said to be reduced if it loses oxygen during a reaction.
    (iv) A substance is said to be reduced if it gains hydrogen during a reaction.

  • Question 3
    1 / -0

    Which of the following reactions involves a physical change?

  • Question 4
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    Which of the following food items do/does not become rancid?

  • Question 5
    1 / -0

    The characteristic feature of an oxidising agent is that it always

  • Question 6
    1 / -0

    When a small amount of manganese dioxide is added to hydrogen peroxide, oxygen is evolved. This is an example of

  • Question 7
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    In the reaction: Zn + H2SO4 → ZnSO4 + H2, zinc undergoes

  • Question 8
    1 / -0

    Which of the following is a balanced chemical equation?

  • Question 9
    1 / -0

    Which of the following is true for all chemical reactions?

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