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When a crystal of potassium peramagnate ...

When a crystal of potassium peramagnate is placed in a beaker, its purple colour spreads throughout the water. What does this observation tell us about the nature of pottassium permanganate and water?

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Knowledge Check

  • When we put some crystals of potassium permanganate in a beaker containing water, we observe that after some time whole water was turned pink. This is due to

    A
    boiling
    B
    melting of potassium permanganate crystals
    C
    sublimation of crystals
    D
    diffusion

  • When a small piece of beryllium was added to water taken in a beaker, what will you observe?

    A
    Vigorous chemical reaction occurs with evolution of a gas.
    B
    Formation of precipitate is seen .
    C
    Colour of solution turns black.
    D
    No reaction occurs.

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    Archit dropped a crystal of potassium permanganate into two beakers A and B containing hot water and cold water respectively. After keeping the beakers undisturbed for some time what did he observe and why ?

    Even two or three crystals of potassium permanganate can impart colour to a very large volume of water. Which characteristic of particles of matter is illustrated by this observation ?

    All the gases form cathode rays and anode rays when electricity is passed through them : (i) What does the formation of cathode rats tell us about the atoms ? (ii) What des the formation of anode rays tell us about the atoms ?

    (a). What happens when zinc granules are heated with sodium hydroxide solution? Write equation of the reaction which takes place. (b). What happens when bases react with non-metal oxides? Explain with the help of an example. What does this reaction tell us about the natrue of non-metal oxides?

    Some amount of purple coloured potassium permanganate is added to a beaker of water and stirred. How can you separate the component from the above mixture? Is it possible to recover back both the components? Explain.

    Name the process associated with the following (a) Dry ice is kept at room temperature and at one atmospheric pressure. (b) A drop of link placed on the surface of water contained in a glass spreads throughout the water. (c) A potassium permanganate crystal is in a beaker and water is poured into the beaker with stirring. (d) A acetone bottle is left open and the bottle becomes empty. (e) Milk is churned to separate cream from it. (f) Settling of sand when a mixture of sand and water is left undisturbed for some time. (g) Fine beam of light entering through a small hole in a dark room. Illuminates the particles in its paths.

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