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  1. Brass gets discoloured in air due to constant exposure in presence of:

    2. A.

     Aluminium phosphide
    B.

     Hydrogen sulphide
    C.

     Hydrogenated wafers
    D.

     Aluminium sulphide

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    Answer : Option B

    Explanation :

    Brass gets discoloured in air because of Hydrogen sulphide. Transition elements are coloured. The brass is combination of Zn and Cu. But it is discoloured due to hydrogen sulphide in air.

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