Pb and Sn are extracted from their chief ore by:

1. carbon reduction and self-reduction respectively.

2. self-reduction and carbon reduction respectively.

3. electrolysis and self-reduction respectively.

4. self-reduction and self-reduction respectively.

Identify the incorrect statement:

Which metal can be purified by zone refining?

1. Ni

2. Zr

3. In

4. Fe

The fundamental principle of froth flotation process is:

Identify incorrect match -

1. $\mathrm{Kaolinite}<mspace\; width="1em"></mspace>-<mspace\; width="1em"></mspace>{\mathrm{Al}}_2{\left(\mathrm{OH}\right)}_4{\mathrm{Si}}_2{\mathrm{O}}_5$

2. $\mathrm{Cuprite}<mspace\; width="1em"></mspace>-<mspace\; width="1em"></mspace>{\mathrm{Cu}}_2\mathrm{O}$

3. $\mathrm{Siderite}<mspace\; width="1em"></mspace>-<mspace\; width="1em"></mspace>{\mathrm{FeCO}}_3$

4. $\mathrm{Calamine}<mspace\; width="1em"></mspace>-<mspace\; width="1em"></mspace>{\mathrm{ZnSO}}_4$

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.

$\mathrm{MS}<mspace\; width="1em"></mspace>+<mspace\; width="1em"></mspace>{\mathrm{O}}_2<mspace\; width="1em"></mspace>\stackrel{}{\to }<mspace\; width="1em"></mspace>{\mathrm{MO\; +SO2<mspace\; width="1em"></mspace>}}_{}{\mathrm{MO}}_{}<mspace\; width="1em"></mspace>+<mspace\; width="1em"></mspace>\mathrm{MS}<mspace\; width="1em"></mspace>\stackrel{}{\to }<mspace\; width="1em"></mspace>2\mathrm{M}<mspace\; width="1em"></mspace>+<mspace\; width="1em"></mspace>2{\mathrm{SO}}_2$

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.  ${\mathrm{Na}}_2\mathrm{O}$