Identify the incorrect statement:

1.	The scientific and technological process used for isolation of the metal from its ore is known as metallurgy
2.	Minerals are naturally occurring chemical substances in the earth's crust
3.	Ores are minerals that may contain a metal
4.	Gangue is an ore contaminated with undesired materials

The fundamental principle of froth flotation process is:

Identify incorrect match -

1. $\mathrm{Kaolinite} - {\mathrm{Al}}_2{\left(\mathrm{OH}\right)}_4{\mathrm{Si}}_2{\mathrm{O}}_5$

2. $\mathrm{Cuprite} - {\mathrm{Cu}}_2\mathrm{O}$

3. $\mathrm{Siderite} - {\mathrm{FeCO}}_3$

4. $\mathrm{Calamine} - {\mathrm{ZnSO}}_4$

Which among the following is not an oxide ore?

1. Malachite

2. Cuprite

3. Zincite

4. Bauxite

Mg in the Kroll process acts as

(1)  Reducing agent

(2)  Oxidizing agent

(3)  Oxidizing agent at low temperature

(4)  Reducing agent at low temperature

The process of converting hydrated alumina into anhydrous alumina is called

1. Roasting

2. Smelting

3. Dressing

4. Calcination

Identify the metal M, which has the following extraction principle.

$\mathrm{MS} + {\mathrm{O}}_2 \stackrel{}{\to } {\mathrm{MO\; +SO2 }}_{}{\mathrm{MO}}_{} + \mathrm{MS} \stackrel{}{\to } 2\mathrm{M} + 2{\mathrm{SO}}_2$

1.  Mg

2.  Pb

3.  Sn

4.  Fe

Compound (D) is

1.  ${\mathrm{NaAlO}}_2$

2.  $\mathrm{Al}{\left(\mathrm{OH}\right)}_3$

3.  ${\mathrm{Al}}_2{\mathrm{O}}_3$

4.  ${\mathrm{Na}}_2\mathrm{O}$

Consider the following metallurgical process

$\mathrm{Sulphide} \stackrel{∆}{\to } \mathrm{oxide} \stackrel{∆}{\to } \mathrm{impure} \mathrm{metal} \stackrel{∆}{\to } \mathrm{pure} \mathrm{metal}$

The various processes A, B, and C respectively

1.  Calcination, smelting, and electrolysis

2.  Roasting, smelting, and electrolysis

3.  Calcination, auto reduction, and bassemetisation

4.  Roasting, aluminothermic reduction, electrolysis

NaCN is a depressant that is used: