Mark the wrong statement.

  • A
    Wrought iron is prepared by heating cast iron in a reverberatory furnace.
  • B
    The impurities present in cast iron are oxidised by air.
  • C
    The impurities are oxidised by $Fe_2O_3$.
  • D
    $CO$ burns with blue flame and the $Si, Mn$ and other impurities form slag with silica.

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$4M + 8CN^- + 2H_2O + O_2 \xrightarrow{} 4[M(CN)_2]^- + 4OH^-$

According to the Ellingham diagram,at lower temperatures,the oxidation of $C$ to $CO$ is useful for the reduction of which of the following?

In the manufacture of iron,limestone is added to the blast furnace. The calcium ion ends up in the form of:

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