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Explain the following : Why the wooden...

Explain the following :
Why the wooden shelves on which concentrated sulphuric acid bottles are kept stained black ?

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Knowledge Check

  • When sodium chloride is heated with concentrated sulphuric acid, the gas liberated is

    A
    Chlorine
    B
    Sulphur dioxide
    C
    Hydrogen chloride
    D
    Sulphur trioxide

  • When copper metal is treated with concentrated sulphuric acid, the gas liberated is

    A
    Hydrogen
    B
    Sulphur dioxide
    C
    Hydrogen sulphide
    D
    Ammonia

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