कौन सी धातु एक बड़े शहर की ह – McqOptions

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1.	कौन सी धातु एक बड़े शहर की हवा को प्रदूषित करती है?
A.	तांबा
B.	क्रोमियम
C.	प्रमुख
D.	कैडमियम
Answer» B. क्रोमियम

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