12th Chemistry Important 1 Marks Metallurgy
One Mark Study Material Unit wise as per reduced syllabus (2021-22)
TN 12th Chemistry Important One Mark Questions Chapter 1 Metallurgy. 12th Chemistry Important Questions Chapter 1. +2 Chemistry Important 2 Marks, 3 Marks, 5 Marks Questions Based on reduced Syllabus 2021-2022. 12th Free Online Test (MCQs). HSC 12th Chemistry Revision Test Important Questions. 12th Tamil Full Guide.
12th Chemistry Important 1 Marks Metallurgy
Chapter – 1. Metallurgy:
- In the froth floatation process for the purification of ores the particles that because their surface is not easily wetted by water.
- Oxides ores are concentrated by hydraulic washing.
- Acid type of leaching process converts insoluble sulphide ore into soluble sulphates.
- Depressing agents used to separate ZnS from PbS is NaCN
- Metals having low melting points such as Sn, PB, Hg & Bi are refined by Liquation.
- Ni, Cu, CO the following ores are undergoing Ammonia leaching process.
- Ag2O, HgOoxides will decompose on heating even in the absence of a reducing agent.
- Zn > Cu >Ag is the correct order of reactivity of metals.
- Froth floatation process is applicable for Sulphide ores.
- Tinstone, Chromite, & Pyrolusite are concentrated by Magnetic separation.
- The process of Gold is reduced to its elemental state is called as Cementation
- Leaching method is based on the solubility of the ore in a suitable splvent.
- The process of ore into metal oxide with absence of air is called as Calcination
- The process of heating of copper pyrites to remove sulphur is called Roasting
- Semi-conductors are purified by method Zone refining
- In a metallurgical process, an acid flux is used for removing basic gangue
- Malachite has CuCO3.Cu(OH)2
- Ignition mixture used in aluminothermic process is Mg + BaO2
- Na[Ag(CN)2] is Sodium dicyano argentite
- Magnetic separation it is based on the difference in the Magnetic properties of the ore and the impurities.
- Zinc is extracted from zinc blende by Carbon reduction process
- Zinc metal is used for extraction of Gold and Silver for galvanization of iron object.
- Zone refining is based on the principle is fractional crystallization
- Malachite is not a mineral of Aluminum
- Galena(Pbs) & HgS will give respective metal by self-reduction.
- In the extraction of copper from its sulphide ore, the metal is finally obtained by Copper (I) sulphide (Cu2S
- Dolomite mineral contain Calcium as well as Madnesium.
- In the froth floatation process the collectors such as pine oil and Xanthates , etc, enhances Non – wettability of the mineral particles in water.
- Concentration of copper glance is done by froth flotation
- Rock salt is the halide ore.
- In the metallurgy of iron, limestone is added to coke which act as a flux
- Metal oxide is converted into metal by Smelting
- In froth floatation sodium ethyl Xanthate is used as Collector
- Leaching Process is a Redox reaction
- The complex formed when Sodium cyanide is added to galena in which Zinc sulphide is the impurity is Na2[Zn(CN)4]
- Zinc is not refined by liquation
- Cr2O3 can be reduced by Aluminothermic process
- Magnesite is Magnesium carbonate
- Gangue + Flux → Slag
- Van-Arkel method is based on the principle of thermal decomposition of metal.
- Matte is the mixture of Cu2S & FeS
- Blister copper contains 98%
- Titanium & Zirconium can be purified by Van-Arkel method or vapor phasemethod.
- During the roasting process Sulphur dioxide gas (SO2)is released.
- During the Calcination process Carbon dioxide gas (CO2)is released.
- Bauxite has composition Al2O3.nH2O
- Wolframite ore is separated from tinstone by the process of Electromagnetic separation.
- Flux is a substance which is used to convert infusible impurities to soluble impurities
- Cyanide Process Extraction of Gold (Au).
- Froth floatation process Dressing of ZnS
- Electrolytic reduction Extraction of Aluminum (Al)
- Zone refining Ultra pure Germanium (Ge)
- In the electrolytic refining of copper, impure copper used as anode.
- Stefinite has composition Ag3SbS4
- Ni(s) + 4CO(g) → (350K) [Ni(CO)4](g) ,
- [Ni(CO)4](g) → (460K) Ni(s) + 4CO(g)
- Ti(s) + 2I2 (s) →(550K)/∆ TiI4 (vapor)
- 5 TiI4(Vapor) →(1800K)/∆ Ti (s) + 2I2(8)
- Gibbs free energy change for the electrolysis process is given by the following expression ∆G0 = – nFE0
- In modern metallurgical factories, SO2 by product is trapped and convertedinto Sulphuric acid to avoid air pollution.
