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
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:
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) |
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
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.