A major impurity in pig iron is:
1. Carbon
2. Silicon
3. Phosphorus
4. Manganese
Among the following an iron mineral is:
1. Malachite
2. Cassiterite
3. Pyrolusite
4. Magnetite
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 +
[X] + Zn [Y] + Ag
[X], and [Y] in the above mentioned reaction are:
1. X= [Ag(CN)]; Y = [Zn(CN)]-2
2. X= [Ag(CN)]-3; Y=[Zn(CN)]-2
3. X= [Ag(CN)]; Y=[Zn(CN)]
4. X=[Ag(CN)] ; Y= [Zn(CN)]2
The correct match among the following is:
Column I | Column II |
(a) Boron | (i) Van Arkel method |
(b) Tin | (ii) Mond's process |
(c) Zirconium | (iii) Liquation |
(d) Nickel | (iv) Zone refining |
(a) | (b) | (c) | (d) | |
1. | (iv) | (iii) | (i) | (ii) |
2. | (iv) | (iii) | (ii) | (i) |
3. | (ii) | (i) | (iv) | (iii) |
4. | (iii) | (iv) | (i) | (ii) |
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.
2.
3.
4.
2MS + 3O2 → 2MO + 2SO2
2MO + MS → 3M + SO2
The metal M in above-mentioned reaction is:
1. Mg
2. Pb
3. Sn
4. Fe