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Account for the following : (a) White ...

Account for the following :
(a) White silver chloride turns grey in sunlight.
(b) Brown coloured copper powder on heating in air turns into black coloured substance.

Text Solution

Verified by Experts

(a) Silver chloride turns grey on exposure to sunlight because of the following reaction :
`2AgCl overset("Sunlight")(to)underset("(grey)")underset("Metallic silver")(2Ag+Cl_(2))`
(b) Oxidation of copper powder takes place. The oxide formed has a black colour.
`underset("Brown")(2Cu)+O_(2)overset("Heat")(to)underset("Black")(2CuO)`
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Knowledge Check

  • White silver chloride in sunlight turns to

    A
    grey
    B
    yellow
    C
    red
    D
    none of these.

  • Silver chloride turns grey on exposure to sunlight for a long duration due to:

    A
    the formation of silver by decomposition of silver chloride.
    B
    sublimation of silver chloride
    C
    formation of chlorine gas from silver chloride
    D
    oxidation of silver chloride.

  • Assertion (A) White silver chloride turns grey in sunlight. Reason (R) : Copper reacts with zinc sulphate to form copper sulphate and zinc is deposited.

    A
    Both (A) and (R) are true and (R) is correct explanation of the assertion.
    B
    Both (A) and (R) are true but (R) is not the correct explanation of the assertion.
    C
    (A) is true but (R) is false.
    D
    (A) is false but (R) is true.

    • Similar Questions

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    Mention with reason the colour changes observed when: (i) silver chloride is exposed to sunlight. (ii) copper powder is strongly heated in the presence of oxygen. (iii) a piece of zinc is dropped in copper sulphate solution.

    Why do silver articles turn blackish while copper vessels turn greenish on keeping in air for long time?

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    Observe the given figure and answer the question that follows: State True (T) or False (F) for the following statements. (i) It is a photodecomposition reaction. (ii) Silver chloride turns grey in sunlight to form silver metal. (iii) It is an exothermic reaction. (iv) Silver bromide also behaves in the same way and used in black and white photography.

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