Which of the following is not a basic flux?

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:

The major components in "Gun Metal" are

Identify the correct statements from the following:
$I$. Brass is an alloy of copper and nickel
$II$. Bronze is an alloy of copper and zinc
$III$. German silver is an alloy of copper,zinc and nickel
$IV$. Brass is an alloy of copper and zinc

Which alloy contains $Cu$,$Sn$ and $Zn$?

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: