$B_4C$ (boron carbide) is used except:

  • A
    to extract boron
  • B
    as an abrasive for polishing
  • C
    for making bullet-proof clothing
  • D
    for making diborane

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Discuss the pattern of variation in the oxidation states of $(i)$ $B$ to $Tl$ and $(ii)$ $C$ to $Pb$.

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