आई आई टी मद्रास ने किस पदार� – McqOptions

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1.	आई आई टी मद्रास ने किस पदार्थ का प्रयोग नदियों के प्रदुषण को कम करने के लिये किया?
A.	कोयला
B.	तांबा
C.	ग्रेफिन
D.	ग्रेफाईट
Answer» D. ग्रेफाईट

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