1. [C] Ag < Sn < Zn < Ca < Na The metals from least reactive to most reactive is: Ag<Sn<Zn<Ca<Na.

    [C] Ag < Sn < Zn < Ca < Na
    The metals from least reactive to most reactive is: Ag<Sn<Zn<Ca<Na.

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  2. [B] (iv) Only The balanced equation is: Mg + 2H₂0 → Mg(OH)₂ + H₂

    [B] (iv) Only
    The balanced equation is: Mg + 2H₂0 → Mg(OH)₂ + H₂

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  3. [D] All of these Our body needs more energy when we do exercise. We get energy from the oxidation process of food. Due to exercise the body is able to get rid of excess carbon dioxide (CO₂).

    [D] All of these
    Our body needs more energy when we do exercise. We get energy from the oxidation process of food. Due to exercise the body is able to get rid of excess carbon dioxide (CO₂).

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