The correct statement among the following is:  

1.	The rate of reaction cannot be understood from the Ellingham diagram.
2.	During the formation of metal oxide \(\Delta S\) becomes negative and \(\Delta G\) becomes positive resulting in a positive slope.
3.	There is an abrupt change in the slope of the Ellingham line when a change in phase (s→l) or (l→g) takes place.
4.	All of the above.

\((i) Zr + 2I_2 \xrightarrow{870K} ZrI_4 \xrightarrow{2075K} Zr + 2I_2 \)
\((ii) Ni + 4CO \xrightarrow{330K} Ni(CO)_4 \xrightarrow{450K} \underset{(pure)}{Ni} + 4CO \)

The processes (ii) and (i) above, respectively, are  : 

1. Mond's process; Van Arkel process

2. Van Arkel process; Mond's process

3. Goldschmidt process; Mond's process

4. Mond's process; Goldschmidt process

Which metal can be purified by zone refining?

1. Ni

2. Zr

3. In

4. Fe

Identify the incorrect statement:

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