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 

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

The correct match among the following is:

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

Which of the following is an incorrect match?

1. Kaolinite - Al₂(OH)₄Si₂O₅

2. Cuprite - Cu₂O

3. Siderite - FeCO₃

4. Calamine - ZnSO₄

The substance that acts as a collector in the froth flotation method is:

1. Sodium xenate.           

2. Sodium pyrophosphate.

3. Sodium nitroprusside.

4. Sodium ethyl xanthate.