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Railways PYQCBT 1 2016

RRB NTPC · Question 94

Heera is a strict form of A. Oxygen B. Nitrogen C. Mercury D. Carbon

  1. C

  2. A

  3. B

  4. D

Show answer & explanation

Answer: (D) D

Explanation

Diamond (heera) is a crystalline allotrope of carbon and the hardest natural substance.