Advertisements
Advertisements
Question
Explain in brief types of extraction of less reactive metals according to their reactivity.
Advertisements
Solution
Extraction of less reactive metals:
- Less reactive metals such as gold, silver, platinum are found in a free state in nature.
- However, the reserves of copper in the free state are very few. It is found mainly in the form of Cu2S. Copper is obtained from Cu2S ore just by heating in the air.
\[\ce{\underset{\text{sulphide}}{\underset{\text{Copper(I)}}{2Cu2S_{(s)}}} + \underset{\text{Oxygen}}{3O_{2(g)}} ->[Heat] \underset{\text{oxide}}{\underset{\text{Copper(I)}}{2Cu2O_{(s)}}} + \underset{\text{dioxide}}{\underset{\text{Sulphur}}{2SO2\uparrow}}}\]
\[\ce{\underset{\text{Copper(I) sulphide}}{Cu2S_{(s)}} + \underset{\text{Copper(I) oxide}}{2Cu2O_{(s)}} ->[Heat] \underset{\text{Copper}}{6Cu_{(s)}} + \underset{\text{Sulphur dioxide}}{SO_2\uparrow}}\] - The copper metal thus obtained can be further refined electrolytically.
APPEARS IN
RELATED QUESTIONS
Write the steps involved in the extraction of pure metals in the middle of the activity series from their carbonate ores.
Name one metal which is extracted by electrolytic reduction.
Fill in the following blank with suitable word:
Bronze is an alloy of copper and .........
Name two metals which occur in nature in free state as well as in combined state.
Describe with one example, how moderately reactive metals (which are in the middle of reactivity series) are extracted.
Explain why, an aqueous solution of sodium chloride is not used for the electrolytic extraction of sodium metal.
What iron compound is present in haematite ore? Also write its chemical formula.
How is sodium metal extracted? Explain with the help of equation of the reaction involved.
Name the electrode at which aluminium metal is produced.
Name two ores of zinc. Write the names of the chemical compounds present in them and give their chemical formulae.
Which of the following is an ore of mercury metal?
(a) rock salt
(b) cinnabar
(c) calamine
(d) haematite
Which of the following reactants are used to carry out the thermite reaction required for welding the broken railway tracks?
(a) Al2O3 + Fe
(b) MnO2 + Al
(c) Fe2O3 + Al
(d) Cu2O + Fe
Give reasons, why aluminum is used in:
In making ships
An element has its electron configuration as 2,8,8,2. Now answer the following questions.
a) What is the atomic number of this element?
b) What is the group of this element?
c) To which period does this element belong?
The following question relate to the extraction of aluminium by electrolysis.
Give the equation for the reaction which takes place at the cathode.
Name the following :
The Process of heating an ore to a high temperature in the presence of air.
Draw a well-labelled diagram of extraction of Aluminium. Write the anode reaction in electrolytic reduction of Alumina.
Read the following passage and answer the questions.
According to the reactivity series, zinc is more reactive than iron, iron is more reactive than silver. During study of this, a student dipped the iron nails in silver nitrate solution.
- What is reactivity series?
- What will happen when iron nails are dipped in silver nitrate solution?
- Which type of reaction happens when iron metal reacts with silver nitrate solution?
- What will happen if a zinc rod is used instead of iron nail?
Answer the questions on the following passage.
The minerals from which the metal can be separated economically are called ores. Ores contain many types of impurities such as soil, sand and rocky substances along with metal compounds. These impurities are called gangue.
Metals can be extracted from their ores by means of various methods of separation. The process of extraction of metal in a pure state from the ores is also a part of metallurgy.
Ores are taken out from the mines and the gangue is usually separated from the ore at the site itself by various methods. Then the ores are carried out to the place where metals are produced. Here metals are extracted in pure form. Then metals are further purified by different methods of purification. This entire process is called metallurgy. Most metals being reactive do not occur in nature in the free state but are found in combined state as their salts such as oxides, carbonates, sulphides, and nitrates. however, the most unreactive metals that are not affected by air, water and other natural factors like silver, gold, platinum, generally occur in a free state. The compounds of metals that occur in nature along with the impurities are called minerals.
- What are ores?
- Which processes are involved in the branch of metallurgy? What is metallurgy?
- Which metals are found in a free state?
- In what forms are metals found in combined state?
- What is gangue?
In extraction of copper, the flux used is ____________.
