One of the following metals forms a volatile compound and this property is taken advantage for its extraction. This metal is:
iron
nickel
cobalt
tungsten
Gold is extracted by hydrometallurgical process, based on its property :
of being electropositive
of being less reactive
to form complexes which are water soluble
to form salts which are water soluble
C.
to form complexes which are water soluble
Hydrometallurgy is the process of dissolving the metal or its ore by the action of a suitable chemical reagent followed by recovery of the metal either by electrolysis or by the use of a suitable precipitating agent.
4Au + 8KCN + 2H2O + 4K[Au(CN)2] + 4KOH
2K[Au(CN)2] + Zn 2Au + K2[Zn(CN)4]
The temperature of the slag zone in metallurgy of iron using blast furnace is :
1200-1500°C
1500-1600°C
400-700°C
800-1000°C
Assertion : Hydrometallurgy involves dissolving the ore in a suitable reagent followed by precipitation by a more electropositive metal.
Reason : Copper is extracted by hydrometallurgy.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false
If both assertion and reason are false.
Which of the following elements is present as the impurity to the maximum extent in pig iron ?
Phosphorus
Manganese
Carbon
Silicon