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When a piece of metal is dropped in cold...

When a piece of metal is dropped in cold water, the water slowly becomes turbid and effervescence is observed. What will you observe, if blue litmus paper is dipped into the turbid water ? Indentify the metal and justify the observation.

Text Solution

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(i) Indentification of metal that reacts with cold water but does not produce any flame.
(ii) reaction between the metal and water.
(iii) product formed in the above reaction.
(iv) solubility of the product in water
(v) nature of aqueous solution formed
(vi) identification of changes observed when blue litmus paper is dipped in the above solution.
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Knowledge Check

  • When a piece of sodium metal is dropped in water, hydrogen gas evolved because

    A
    sodium is reduced and acts as an oxidising agent
    B
    water is oxidised and act as a reducing agent
    C
    sodium loses electrons and is oxidised while water is reduced
    D
    water loses electrons and is oxidised to hydrogen.

  • When a piece of sodium metal is dropped in water, a reaction takes place to yield hydrogen because:

    A
    sodium loses electrons
    B
    sodium acts as an oxidising agent
    C
    water loses electrons
    D
    water acts as a reducing agent

  • What will you observe when calcium is treated with water?

    A
    It reacts violently with water.
    B
    It reacts slowly to form calcium oxide.
    C
    Bubbles of hydrogen gas are formed which stick to the surface of calcium
    D
    It does not react with water.

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