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  1. Which one of the following metals pollutes the air of a city having large number of automobiles?

    2. A.

     Cadmium
    B.

     Chromium
    C.

     Lead
    D.

     Copper

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    Answer : Option C

    Explanation :

    Tetra ethyl lead (C2H5)4 Pb is used as an antiknock compound . It is mixed with petrol to improve its quality. Therefore automobile exhausts lead, which pollutes city.

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