Telangana SCERT Class 10 Physical Science Chapter 11 Solution – Principles of Metallurgy. Here in this post we provides Class 10 Physical Science Principles of Metallurgy Telangana State Board Solution. Telangana State Board English Class X Medium Students can download this Solution to Solve out Improve Your Learning Questions and Answers.
Telangana State Board Class 10 Physical Science Chapter 11 Principles of Metallurgy Solution:
CHAPTER: – 11.
Principles of Metallurgy
Exercise: –
Reflections on concepts
1) List three metals that are found in nature as Oxide ores. (AS1)
Ans: – Fe, Mn, Zn are the metals that are found in nature as oxide ores.
2) List three metals that are found in nature in un combined form. (AS1)
Ans: – Platinum, gold, silver is found in un combined form.
3) Write a note on dressing of ore in metallurgy? (AS1)
Ans: – The metal ore which are recovering from the mines it goes through various process to remove impurities present in the metal.After collecting there is seen various impurities present like soil, sand, gravel etc. This process is known as dressing.
4) How do metals occur in nature? Give examples to any two types of minerals. (AS1)
Ans: – The maximum percentage of substance when present in metal these typesof minerals are known as ore. For calling an ore of a mineral there are alwayshave maximum availability of that metal in the mineral would be present after recycling it from the raw state. Example: – Fe2O3, Fe3O4.
5) When do we use magnetic separation method for concentration of an ore? Explain with an example. (AS1)
Ans: – The magnetic separation helps us for finding the concentration of different magnetic material. In this process magnetic belt which are there are attract the mineral and the impurities and after that left away impurities. As an example: – extraction of iron from hematite (Fe2O3).
6) What is the difference between roasting and calcination? Give one example for each. (AS1)
Ans: – Roasting process which described that any presence of air in a mineral but calcination is different process in the calcination takes places in absent of water. For an example: – Zn. is separated by roasting, Ca is separated by calcination.
7) Draw the diagram showing i) Froth floatation ii) Magnetic separation. (AS5)
Ans: – i) Forth floatation: –
ii) Magnetic separation: –
8) Draw a neat diagram of riverboratory furnace and label it. (AS5)
Application of concepts
1) Magnesium is an active metal, if it occurs as a chloride in nature, which method of reduction is suitable for its extraction? (AS2)
Ans: – Electrolysis is the method of this suitable extraction as magnesium forms in magnesium chloride formed.
2) Mention two methods which produce very pure metals from impure metals. (AS1)
Ans: – Electrolysis and reduction are the example of the process by which any metals purified.
3) Which method do you suggest for extracting of high reactivity metals? (AS2)
Ans: – In electrolysis high reactive metals are extracted.
4)Explain Thermite process and mention its applications in our daily life. (AS7)
Ans: – Various metal which are joined or separated by the mixing of various reactive material. The high temperature is use in this his reaction because of this thermite process. Most of the railway track in the world are joined by this process.
5) Where do we use handpicking and washing methods in our daily life? Give examples. How do you correlate these examples with enrichment of ore? (AS7)
Ans: – The hand picking which are being used in daily life are cleaning are rise, grading vegetables and fruit etc. The washing is helps to clean the cloth or removing different substance which affect the food item also. After applying this process different ore tobe washed away the different impurities. The denser particle is stayed because of high density and less dense are removed as well.
MULTIPLE CHOICE QUESTIONS
1.) The impurity present in the ore is called as
a) Gangue b) flux c) Slag d) Mineral.
Ans: – option (a)
2.) Which of the following is a carbonate ore?
a) Magnesite b) Bauxite c) Gypsum d) Galena.
Ans: option (a)
3.) Which of the following is the correct formula of Gypsum
a) CuSO4. 2H2O b) CaSO4. ½ H2O c) CuSO4. 5H2O d) CaSO4. 2H2O.
Ans: – option (b).
4.) The oil used in the froth floatation process is
a) kerosene oil b) pine oil c) coconut oil d) olive oil.
Ans: – Option (b).
5.) Froth floatation is method used for the purification of ___sulphide___ore.
a) sulphide b) oxide c) carbonate d) nitrate
6.) Galena is an ore of
a) Zn b) Pb c) Hg d) Al.
Ans: – option (b).
7.) The metal that occurs in the native form is
a) Pb b) Au c) Fe d) Hg.
Ans: – option (b)
8.) The most abundant metal in the earth’s crust is
a) silver b) Aluminium c) zinc d) iron.
Ans: – option (b).
9.) The reducing agent in thermite process is
a) Al b) Mg c) Fe d) Si.
Ans: – option (a)
10.) The purpose of smelting an ore is
a) Oxidise b) Reduce c) Neutralise d) None of these.
Ans: – Option (b).
More Question and Answers (Extra)
Q.1) MCQ.
1) Process of extraction of metals from their ores is……………?
a) Gangue
b) Metallurgy
c) Roasting
d) Calcination
2) Which metal obtain from one Epsom salt?
a) Al
b) Cu
c) Mg
d) Zn
3) Which of the following is formula of Limestone?
a) MnO2
b) fe2O3
c) CaCO3
d) HgS
4) Which of the following is low reactive metal?
a) Ag
b) Na
c) Zn
d) Fe
5) Which of the following is not process of concentration of Ore?
a) Calcination c) Reduction
b) Electrolysis d) Magnetic Separation
6) Which of the following is refining method of a metal?
a) Oxidation
b) Poling
c) Reduction
d) Calcination
7) Impurity present in Ore is……………?
a) Flue
b) Mineral
c) Gangue
d) Slag
8) Oil used in froth flotation process is……….?
a) Coconut oil
b) Mustard oil
c) Olive oil
d) Pine oil
9) The reducing agent in thermite process is………….?
a) Fe
b) Al
c) Si
d) Mn
Q.2) SHORT ANSWER QUESTIONS.
1) Define mineral. Give example.
→ A metallic compound occurring in the earth crust along with the
Impurities is called mineral.
e.g., Al2O3 , ZnS
2) Define Ore?
→ A mineral from which a metal can be extracted economically and Conveniently is called Ore.
3) What is Flue?
→ The substance added to Ore to remove gangue from it is called as flue
4) Enlist three stages of Extraction of metals?
→ 1) Concentration
2) Extraction of Crude metal
3) Refining of the metal
5) Define Calcination?
→ Calcination is the process of heating the Ore strongly in the absence Of air or Oxygen in which Carbonate to its Oxide.
6) What is furnace & give the names of its parts?
→ Furnace is used to carry out pyrochemical process in metallurgy.
Three parts of furnace are Hearth, Chimney, and fire box.
7) What is smelting process?
→ Smelting is a pyrochemical process in which Ore is mixed with flux & fuel and strongly heated.
8) List out the process of concentration of Ore?
→ 1) Hand picking
2) Washing
3) Froth flotation
4) Magnetic Separation
Q.3) SHORT ANSWER QUESTIONS.
1) Complete the table: –
| S.N. | ORE | Formula | Metal extracted |
| 1 | Zinc Blende | ||
| 2 | Bauxite | ||
| 3 | Rock Salt | ||
| 4 | Haematite | ||
| 5 | Pyrolusite |
2) Give difference between roasting and Calcination?
Answers:
1) Complete the table: –
| S.N. | ORE | Formula | Metal extracted |
| 1 | Zinc Blende | ZnS | Zn |
| 2 | Bauxite | Al2O3 2H2O | Al |
| 3 | Rock Salt | NaCl | Na |
| 4 | Haematite | Fe2 O3 | Fe |
| 5 | Pyrolusite | MnO2 | Mn |
2) Give difference between roasting and Calcination?
|
Roasting |
Calcination |
| 1.Roasting is a process in which Ore is heated in presence of oxygen or air below its melting point. | 1.Calcination is a process in which are is heated in absence of air |
| 2.The products like metal Oxide from the sulphide are obtained in solid state. | 2.The Ore gets generally decom posed in the process |
| 3.) ZnS + 3O2 → 2ZnO + 2SO2 | CaCO3 → Cao + CO2 |
Q.4) LONG ANSWER QUESTIONS.
Q.4) LONG ANSWER QUESTIONS.
1) Explain dressing of Ore in metallurgy?
→ 1) Concentration of Ore is also called as dressing of Ore. Ores mined From earth’s crust contaminated with large amount of impurities Such as Soil and Sand etc.
2) Concentration or dressing of an Ore includes removal of unwanted Rocky material from Ore. Impurities like soil and clay are called Gangue. Concentration or dressing of Ore includes following methods
1) Hand picking
2) Washing
3) Froth Flotation
4) Magnetic Separation.
2) Explain Smelting process.
→ Smelting is a pyrochemical process which Ore is mixed with flux and Fuel and strongly heated. The heat is so strong that Ore is reduced to Even metal as in molten state.
During smelting, impurities in the Ore reacts with flux to form a slag And is removed.
For hematite (fe2O3) are, cake is used an fuel and limestone ( CaCO3)
Used as flux.
Smelting is carried out in a blast furnace.
Reactions: –
2C + O2 → 2 CO
Fe2O3 + 3 CO → 2 Fe + 3 CO2
CaCO3→ Ca O + CO2
Ca O + SiO2 → CaSio3
3) Draw the diagram of,
1) Froth Floatation
2) Magnetic Separation.
