1. A homogeneous mixture is a mixture having a uniform composition throughout the mixture. For example: salt in water, sugar in water, copper sulphate in water A heterogeneous mixture is a mixture having a non-uniform composition throughout the mixture. For example: sodium chloride and iron fillings, sRead more

    A homogeneous mixture is a mixture having a uniform composition throughout the mixture. For example: salt in water, sugar in water, copper sulphate in water
    A heterogeneous mixture is a mixture having a non-uniform composition throughout the mixture. For example: sodium chloride and iron fillings, salt and sulphur, oil and water

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  2. A pure substance is the one that consists of a single type of particles, i.e., all constituent particles of the substance have the same chemical nature. Pure substances can be classified as elements or compounds. For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-Read more

    A pure substance is the one that consists of a single type of particles, i.e., all constituent particles of the substance have the same chemical nature. Pure substances can be classified as elements or compounds.

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  3. Following are Chemical changes. (a) Growth of a plant (b) Rusting of iron (c) Cooking of food (d) Digestion of food (e) Burning of a candle.

    Following are Chemical changes.
    (a) Growth of a plant
    (b) Rusting of iron
    (c) Cooking of food
    (d) Digestion of food
    (e) Burning of a candle.

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  4. Elements - sodium, silver, tin, silicon. Compounds - calcium carbonate, methane, carbon dioxide. Mixtures - soil, sugar solution, coal, air, soap, blood. For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-2/

    Elements – sodium, silver, tin, silicon.
    Compounds – calcium carbonate, methane, carbon dioxide.
    Mixtures – soil, sugar solution, coal, air, soap, blood.

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  5. (b) and (d) are colloids and will show Tyndall Effect. For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-2/

    (b) and (d) are colloids and will show Tyndall Effect.

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