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Explain the following reaction with the balanced equation. Zinc sulphide is heated strongly in excess of air

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प्रश्न

Explain the following reaction with the balanced equation.

Zinc sulphide is heated strongly in excess of air

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उत्तर

Zinc sulphide is heated strongly in excess of air to convert it to zinc oxide. This process is called roasting.

\[\ce{\underset{\text{Zinc sulphide}}{2ZnS_{(s)}} + 3O_{2(g)} -> \underset{\text{Zinc oxide}}{2ZnO_{(s)}} + \underset{\text{Sulphur dioxide}}{2SO_2↑}}\]

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अध्याय 8: Metallugy - Explain the following reactions with the balanced equations

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एससीईआरटी महाराष्ट्र Science and Technology Part 1 [English] Standard 10 Maharashtra State Board
अध्याय 8 Metallugy
Explain the following reactions with the balanced equations | Q 11

संबंधित प्रश्न

In the extraction of aluminium: Why is it necessary to replace anodes time to time?


Explain givem equation, what happens when a mixture of Cu2O and Cu2S is heated?


Which metal is extracted from cinnabar ore?


Which gas is produced during the extraction of aluminium? At which electrode is this gas produced?


Which metal is extracted from calamine ore?


Which of the following is an iron ore?
(a) cinnabar
(b) calamine
(c) haematite
(d) rock salt


The articles made of silver metal become dark on prolonged exposure to air. This is due to the formation of a layer of its:
(a) oxide
(b) hydride
(c) sulphide
(d) carbonate


A metal which exists as a liquid at room temperature is obtained by heating its sulphide ore in the presence of air.
(a) Name the metal and write its chemical symbol.
(b) Write the name and formula of the sulphide ore.
(c) Give the equations of chemical reactions involved in the production of metal from its sulphide ore.
(d) Name a common device in which this metal is used.
(e) Can this metal displace copper from copper sulphate solution? Why?


State three objectives achieved during the roasting of ores.


What is meant by refining of metals? Name the three common methods used for refining.


Complete the incomplete statement with missing words:
Metals are ______ while non-metals are ______ conductors of heat.


Calcium, copper, lead, aluminium, zinc, chromium, magnesium, iron.
Choose the major metals from the list given above to make the following alloys:
(a) Stainless steel
(b) brass


_______ is the least reactive metal.


In Electrolytic reduction of alumina, Anode : _______ : : Cathode : Graphite lining


Explain in brief types of extraction of highly reactive metals according to their reactivity.


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.

  1. What are ores?
  2. Which processes are involved in the branch of metallurgy? What is metallurgy?
  3. Which metals are found in a free state?
  4. In what forms are metals found in combined state?
  5. What is gangue?

Which of the following ore is concentrated by the Froth floatation process?


2 mL each of concentrated HCl, HNO3 and a mixture of concentrated HCl and concentrated HNO3 in the ratio of 3 : 1 were taken in test tubes labelled as A, B and C. A small piece of metal was put in each test tube. No change occurred in test tubes A and B but the metal got dissolved in test tube C respectively. The metal could be


On the basis of reactivity metals are grouped into three categories: 

  1. Metals of low reactivity
  2. Metals of medium reactivity
  3. Metals of high reactivity

Therefore metals are extracted in pure form from their ores on the basis of their chemical properties.

Metals of high reactivity are extracted from their ores by electrolysis of the molten ore.

Metals of low reactivity are extracted from their sulphide ores, which are converted into their oxides. The oxides of these metals are reduced to metals by simple heating.

(a) Name the process of reduction used for a metal that gives vigorous reaction with air and water both.

(b) Carbon cannot be used as a reducing agent to obtain aluminium from its oxide? Why?

(c) Describe briefly the method to obtain mercury from cinnabar. Write the chemical equation for the reactions involved in the process.

                                     OR

(c) Differentiate between roasting and calcination giving chemical equation for each. 


A mineral from which the metal can be extracted economically and conveniently is known as ______.


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