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The correct answer is C
Black lung disease occurs in people working in
Brass is made of
Find the odd one:
One property of ammonia is
Mercury is a :
Ozone layer is present in
The gas that usually causes explosions in coal mines is
Bakelite is a copolymer of Phenol and
Taj Mahal is greatly affected due to:
Of the following which one pollutes the air of abig city?