Blister copper is ..........

Solder is an alloy of

Match the following:

List-$I$	List-$II$
$A. Al_2O_3 + 2NaOH + 3H_2O \rightarrow 2Na[Al(OH)_4]$	$I. \text{Roasting}$
$B. Ni(CO)_4 \xrightarrow{230^{\circ}C} Ni + 4CO$	$II. \text{Calcination}$
$C. Fe_2O_3 \cdot 3H_2O \xrightarrow{\Delta} Fe_2O_3 + 3H_2O$	$III. \text{Vapour phase refining}$
$D. 2PbS + 3O_2 \rightarrow 2PbO + 2SO_2$	$IV. \text{Electrolysis}$
	$V. \text{Leaching}$

The correct answer is:

What is the approximate ratio of roasted ore,coke and limestone respectively in the charge to be added into the blast furnace for the extraction of iron?

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.

Match List-$I$ with List-$II$ (Both having metallurgical terms):

List-$I$	List-$II$
$A$. Concentration of $Ag$ ore	$I$. Reverberatory furnace
$B$. Blast furnace	$II$. Pig iron
$C$. Blister copper	$III$. Leaching with dilute $NaCN$ solution
$D$. Froth floatation method	$IV$. Sulfide ores

Choose the correct answer from the options given below: