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Which among the following elements (metals) pollutes the air of a city having large number of automobiles |
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(a) |
Cadmium |
(b) |
Lead |
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(c) |
Chromium |
(d) |
Nickel |
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Which among the following elements (metals) pollutes the air of a city having large number of automobiles |
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|||
|
(a) |
Cadmium |
(b) |
Lead |
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|
(c) |
Chromium |
(d) |
Nickel |
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