The advantage$(s)$ of using $O_2$ rather than air in the steel industry is(are):
$(I)$ There is a faster conversion,so a given plant can produce more steel in a day.
$(II)$ Larger quantities can be handled.
$(III)$ It gives a purer product,and the surface is free from nitrides.

  • A
    $I$ only
  • B
    $II$ and $III$ only
  • C
    $II$ only
  • D
    $I, II$ and $III$

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By annealing,steel

$A$ metal $(M)$ exists in oxide form. Its oxide cannot be reduced by carbon up to $800\, ^\circ C$,but it can be reduced by $Al$ even below $800\, ^\circ C$. Select the correct Ellingham diagram for metal $(M)$.

Which of the following statements is not correct?

Match List-$I$ with List-$II$ and select the correct answer using the codes given below the lists :
List-$I$ List-$II$
$(a)$ van Arkel method $1$. Manufacture of caustic soda
$(b)$ Solvay process $2$. Purification of titanium
$(c)$ Cupellation $3$. Manufacture of $Na_2CO_3$
$(d)$ Poling $4$. Purification of copper
$ $ $5$. Refining of silver

Codes :

Type metal is an alloy of $Pb, Sb$ and $Sn$. It consists of

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