Metallurgy
Chapter 8: Metallurgy
- Divide the metals Cu, Zn, Ca, Mg, Fe, Na, Li into three groups, namely reactive metals, moderately reactive metals and less reactive metals. Highly reactive metals moderately reactive metals less reactive metals. Ca Fe Au Mg Zn Ag Na Cu Pt Li 1
- Complete the following statement using every given options. During the extraction of aluminium..............
- Zinc oxide is dissolved in dilute hydrochloric acid. 1) This is a double displacement reaction. 2) Zinc Oxide is an inorganic compound with formula ZnO. 3) It is insoluble in water. 4) When Zin... 2
- Electrolysis of alumina is done. The electrolysis of alumina is carried out in a steel tank lined inside with graphite. The graphite lining serves as cathode. Anode is also... 1
- A reaction was brought about between ferric oxide and aluminium. Aluminium is more reactive than iron. Aluminium metal replaces iron from ferric oxide to form aluminium oxide and iron. Chemical Equation: 2... 1
- Write chemical equation for the following events. Iron filings are dropped in aqueous solution of copper sulphate iron is more reactive than copper. it is displacement reaction in which iron displace copper sulphate in the reaction. colour of the solutio... 1
- Write chemical equation for the following events. Aluminium came in contact with air. Aluminum is a very reactive metal. The outer surface of the metal is actually covered by a very thin layer of the oxide which keeps the meta... 1
- Draw a neat labelled diagram Hydraulic separation method. labelled diagram 1
- Draw a neat labelled diagram Electrolytic reduction of alumina. labelled diagram 1
- Draw a neat labelled diagram Froth floatation method. labelled diagram 1
- Draw a neat labelled diagram Magnetic separation method labelled diagram 1
- The electronic configuration of metal ‘A’ is 2,8,1 and that of metal ‘B’ is 2,8,2. 1) moving from left to right in a period of periodic table, the chemical reactivity of elements first decreases from sodium to silicon and t... 2
- When a copper coin is dipped in silver nitrate solution, a glitter appears on the coin after some time. Copper is more reactive than silver. Hence displacement reaction occurs. When copper coin is dipped in silver nitrate solution forming coppe... 1
- Anodes need to be replaced from time to time during the electrolysis of alumina. Anodes needs to be replaced during the electrolysis of the Alumina because they gets oxidized. During the Electrolysis of the Alumina, Oxyge... 1
- Pine oil is used in froth flotation. Answer: Pine oil is used in froth flotation because the ore particles are preferentially wetted by oil, while the gangue (impurities) is wet... 1
- Sodium is always kept in kerosene. Sodium are very reactive metals and kept in kerosene oil to prevent it from coming in contact with oxygen and moisture as they react to form... 1
- Generally the ionic compounds have high melting points. Ionic compounds are mostly solids and are packed in a crystal lattice structure . They have strong electrovalent bonds between the constitue... 1
- Lemon or tamarind is used for cleaning copper vessels turned greenish. Copper reacts with carbon dioxide in the air to form copper carbonate. As a result, copper loses its shiny brown surface forming a green lay... 1
- Explain the term Gangue The impurities present in the one such as sand , rocks etc are known as gangue. 2
- Explain the term Minerals The compounds of metals that occur in nature along with the impurities are called minerals. minerals are the natural source in which the met... 1
- Explain the term Ores metals are commercially extracted from minerals at low cost and minimum efforts .These minerals are called ores. ores are raw materials for... 1
- Metallurgy Explain the terms. Metallurgy defined as extraction of metal from their pure form. metals are commercially extracted from minerals at low cost and minimum effo... 2
- Identify the pairs of metals and their ores from the following. Group A. Group B A. Bauxite. 1. Aluminium B. Cassiterite. 2.Tin c. Cinnabar. 3. Mercury 1
- Make pairs of substances and their properties Substance. Property A. Potassium bromide. 1.Combustible Substance. Property A.Potassium bromide 1. Soluble in water b. Gold. 2. High ductility. C.Sulphur. 3. Combustible. D. Neon. 4. No chemical r... 1