आधुनिक चर्मशोधन उद्योगों में ऐसी कौनसी भारी धातु पाई जाती है, जो विषैली होती है?
[A] निकेल
[B] जस्ता
[C] क्रोमियम
[D] सीसाl
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Answer:
[C] क्रोमियम
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