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
Roasting of sulphides gives the gas 'X' as a by-product. This is a colourless gas with the choking smell of burnt sulphur and causes great damage to respiratory organs as a result of acid rain. Its aqueous solution is acidic, acts as an oxidising agent, and its acid has never been isolated. The gas 'X' is:
1. SO2
2. CO2
3. SO3
4. H2S
The correct statement among the following is:
1. | Blister copper has a blistered appearance due to the evolution of CO2. |
2. | Vapour phase refining is carried out for nickel by the Van Arkel method. |
3. | Pig iron can be moulded into a variety of shapes. |
4. | Wrought iron is impure iron with 4 % carbon. |
An electrochemical process is used to extract:
1. Iron
2. Lead
3. Sodium
4. Silver
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
Native silver metal forms a water-soluble complex with a dilute aqueous solution of NaCN in the presence of:
1. Nitrogen
2. Oxygen
3. Carbon Dioxide
4. Argon
Iron is extracted from chalcopyrite as :
1. FeO
2. FeS
3. Fe2O3
4. FeSiO3
A metal's oxide that can be reduced by Fe as a reducing agent at a temperature is:
1. Zr
2. Ca
3. Mg
4. None of the above.