Q.

5 METHODS OF SYNTHESIS(ARC-GROWTH, LASER ABLATION, CVD ROUTES, PLASMA CVD)

A. 1992
B. 1991
C. 1990
D. 1993
Answer» B. 1991
Explanation: carbon nano tubes are observed in an year 1991 in the soot of the graphite during the arc discharge. first production of cnt was in 1992 by arc discharge method.
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