Which of the following statements are correct?
$i$. The basic structural unit of silicates is $SiO_4^{4-}$
$ii$. Silicones are biocompatible
$iii$. Producer gas contains $CO$ and $N_2$
The correct option is

  • A
    $i, ii, iii$
  • B
    $ii, iii$ only
  • C
    $i, iii$ only
  • D
    $i, ii$ only

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