Among the following an iron mineral is:

1. Malachite

2. Cassiterite

3. Pyrolusite

4. Magnetite

A major impurity in pig iron is:

1. Carbon

2. Silicon

3. Phosphorus

4. Manganese

What method is used to extract zinc from zinc blende?

1. Electrolytic reduction

2. Roasting followed by reduction with carbon

3. Roasting followed by reduction with another metal

4. Roasting followed by self-reduction

In the process of extraction of silver,

silver ore + ${\mathrm{CN}}^{-}+$ ${\mathrm{H}}_2\mathrm{O}\stackrel{{\mathrm{O}}_2}{\to }$ $$ $$ $$ $$ $$ $\left[\mathrm{X}\right]$ $+$ ${\mathrm{OH}}_{}^{-}$

[X] + Zn $\to$ $$[Y] + Ag

[X], and [Y] in the above mentioned reaction are:

1. X= [Ag(CN)${}_2$]^$-$; Y = [Zn(CN)${}_4$]^-2

2. X= [Ag(CN)${}_2$]^-3; Y=[Zn(CN)${}_4$]^-2

3. X= [Ag(CN)${}_2$]^$-$; Y=[Zn(CN)${}_6$]^$-$

4. X=[Ag(CN)${}_4$]^$-$ ; Y= [Zn(CN)${}_4$]^$-$2 

The correct match among the following is:

At a temperature above 1073 K, coke can be used to reduce FeO to Fe. It can be best explained by:

1. Ellingham diagram.

2. Orgel diagram.

3. Tunabo-Sugano diagram.

4. Born-Haber cycle.

The iron ore that is used to line the reverberatory furnace to prepare the purest form of iron is-

1. Haematite 

2. FeO

3. \(Fe_{3}O_{4}\)

4. None of the above.

Consider the following metallurgical process:

Sulphide  \(\xrightarrow[]{\Delta }\)  oxide  \(\xrightarrow[]{\Delta }\)
Impure metal \(\xrightarrow[]{\Delta }\) pure metal

The processes A, B, and C in the above mentioned reaction are, respectively:

1. Calcination, smelting, and electrolysis

2. Roasting, smelting, and electrolysis

3. Calcination, auto reduction, and bessemerisation

4. Roasting, aluminothermic reduction, electrolysis

Consider the following reaction.
\(\small{Bauxite\ ore\ +\ NaOH\ (conc.) \xrightarrow[\Delta]{Digester} \underset{Soluble}{(A)}}\)
\((A) \xrightarrow{Fresh\ Al(OH)_3}\ \underset{White}{(B)}\ +\ (C)\)
\({(B)} \xrightarrow[]{\Delta}\ (D)\ +\ H_2O\)
What is the molecular formula of compound D?

1. ${\mathrm{NaAlO}}_2$

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

3. ${\mathrm{Al}}_2{\mathrm{O}}_3$

4. ${\mathrm{Na}}_2\mathrm{O}$

2MS + 3O₂ → 2MO + 2SO₂
2MO + MS → 3M + SO₂

The metal M in above-mentioned reaction is:

1. Mg

2. Pb

3. Sn

4. Fe