Science and Technology I · Textbook solutions
Metallurgy
Every solved example, exercise, and miscellaneous question, in the order the textbook teaches them. Plus every board question asked from this chapter. · 33 questions
Exercise
33 q
- Write names.Ex Q1(a)Alloy of sodium with mercury.
- Ex Q1(b)Molecular formula of the common ore of aluminium.
- Ex Q1(c)The oxide that forms salt and water by reacting with both acid and base.
- Ex Q1(d)The device used for grinding an ore.
- Ex Q1(e)The nonmetal having electrical conductivity.
- Ex Q1(f)The reagent that dissolves noble metals.
- Ex Q2Make pairs of substances and their properties
Substance Property a. Potassium bromide 1. Combustible b. Gold 2. Soluble in water c. Sulphur 3. No chemical reaction d. Neon 4. High ductility. - Ex Q3Identify the pairs of metals and their ores from the following.
Group A Group B a. Bauxite i. Mercury b. Cassiterite ii. Aluminium c. Cinnabar iii. Tin - Explain the terms.Ex Q4(a)Metallurgy
- Ex Q4(b)Ores
- Ex Q4(c)Minerals
- Ex Q4(d)Gangue.
- Write scientific reasons.Ex Q5(a)Lemon or tamarind is used for cleaning copper vessels turned greenish.
- Ex Q5(b)Generally the ionic compounds have high melting points.
- Ex Q5(c)Sodium is always kept in kerosene.
- Ex Q5(d)Pine oil is used in froth flotation.
- Ex Q5(e)Anodes need to be replaced from time to time during the electrolysis of alumina.
- Ex Q6When a copper coin is dipped in silver nitrate solution, a glitter appears on the coin after some time. Why does this happen? Write the chemical equation.
- Ex Q7The electronic configuration of metal ‘A’ is 2,8,1 and that of metal ‘B’ is 2,8,2. Which of the two metals is more reactive? Write their reaction with dilute hydrochloric acid.
- Draw a neat labelled diagram.Ex Q8(a)Magnetic separation method.
- Ex Q8(b)Froth floatation method.
- Ex Q8(c)Electrolytic reduction of alumina.
- Ex Q8(d)Hydraulic separation method.
- Write chemical equation for the following events.Ex Q9(a)Aluminium came in contact with air.
- Ex Q9(b)Iron filings are dropped in aqueous solution of copper sulphate.
- Ex Q9(c)A reaction was brought about between ferric oxide and aluminium.
- Ex Q9(d)Electrolysis of alumina is done.
- Ex Q9(e)Zinc oxide is dissolved in dilute hydrochloric acid.
- Complete the following statement using every given options. During the extraction of aluminium…………..Ex Q10(a)Ingredients and gangue in bauxite.
- Ex Q10(b)Use of leaching during the concentration of ore.
- Ex Q10(c)Chemical reaction of transformation of bauxite into alumina by Hall’s process.
- Ex Q10(d)Heating the aluminium ore with concentrated caustic soda.
- Ex Q11Divide the metals Cu, Zn, Ca, Mg, Fe, Na, Li into three groups, namely reactive metals, moderately reactive metals and less reactive metals.
What the board has asked from this chapter
Questions per paper · 11 papers · 2016 to 2026
2016: 1 questions per paper. 2019: 4 questions per paper. 2020: 4 questions per paper. 2022: 5 questions per paper. 2023: 5 questions per paper. 2024: 3.5 questions per paper. 2025: 2.5 questions per paper. 2026: 2 questions per paper
June 2026
2 q
- Q2(B)(v)व्याख्या लिहा : (अ) धातूके (ब) मृदा अशुद्धीDefine: (a) Ores (b) Gangue.Extraction of Metals
- Q4(i)आकृतीचे निरीक्षण करून खालील प्रश्नांची उत्तरे लिहा : (अ) वरील आकृतीतील पद्धतीचे नाव लिहा. (ब) वरील पद्धत कशासाठी वापरतात ? (क) वरील पद्धतीत कोणत्या दोन गुणधर्माचा उपयोग केला जातो ? (ड) ढवळणीचा काय उपयोग आहे ? (इ) संहतीकरण केलेल्या कोणत्याही एका धातुकाचे नाव लिहा.Observe the figure and answer the questions: (a) Name the method shown in the above figure. (b) For what purpose the above method is used? (c) Write two properties which are used in the method. (d) What is the use of agitator? (e) Name any one ore which is concentrated by this method.Extraction of Metals
March 2026
2 q
- Q2(B)(i)संमिश्रे म्हणजे काय ? त्यांची दोन उदाहरणे द्या.What is meant by an 'alloy'? Give two examples.Corrosion and Alloys
- Q4(ii)(अ) ॲल्युमिनिअमच्या निष्कर्षणातील मुख्य पायऱ्या स्पष्ट करा. (ब) ॲल्युमिनाचा विलयबिंदू किती आहे ? तो कमी करण्यासाठी काय करतात ? (क) ॲल्युमिनाचे विद्युत अपघटन होताना धनाग्रे वेळोवेळी का बदलावी लागतात ?(a) Write the main steps in the extraction of aluminium. (b) What is the melting point of alumina and how is the melting point reduced? (c) Why anodes need to be replaced from time to time during the electrolysis of alumina?Extraction of Metals
March 2025
5 q
- Q2(A)(ii)शास्त्रीय कारणे लिहा : विद्युतपारेषणासाठी तांब्याच्या किंवा ॲल्युमिनिअमच्या तारांचा उपयोग करतात.Give scientific reason: For electric power transmission, copper or aluminium wire is used.Properties of Metals and Non-Metals
- Q2(B)(ii)लोखंडी दरवाज्यावर गंज चढू नये म्हणून तुम्ही काय कराल ?What is done to prevent rusting of iron door of your house?Corrosion and Alloys
- Q3(iii)(a) तांब्याची संहत नायट्रिक आम्लाबरोबर अभिक्रिया केली असता. मुक्त होणारा वायू कोणता ? त्याचा रंग सांगा. (b) अभिक्रियेचे संतुलित रासायनिक समीकरण लिहा. (c) अभिक्रियाकारके व उत्पादिते यांची रासायनिक नावे लिहा.(a) What happens when copper reacts with concentrated nitric acid? What is the colour of the gas released during the reaction? (b) Write its balanced chemical equation. (c) Write the names of reactants and products.Properties of Metals and Non-Metals
- Q3(vi)नावे लिहा : (a) सुरीने सहज कापता येतील असे दोन धातू. (b) काही धातूवर आघात केला की त्यांच्यापासून ध्वनी निर्माण होतो. त्या गुणधर्माचे नाव. (c) विद्युतधारेचा सुवाहक असणारा अधातुयुक्त पदार्थ.Name the following: (a) The two metals which can be cut with a knife. (b) A sound is produced when certain metals are struck. Name this property of metals. (c) The non-metallic substance which is a good conductor of electricity.Properties of Metals and Non-Metals
- Q3(vii)खालील आकृतीचे निरीक्षण करून प्रश्नांची उत्तरे लिहा : (a) वरील आकृतीवरून कोणत्या प्रक्रियेचा बोध होतो ? (b) ही प्रक्रिया कशी घडते ? (c) या प्रक्रियेचा वापर करून बनविलेल्या दोन वस्तू.Answer the following questions with the help of the given diagram [an electrolytic cell: a silver plate as the anode and an aluminium spoon as the cathode dipped in an electrolyte, connected to a cell, with and ions in the solution]: (a) Name the process shown in the diagram. (b) How does this process take place? (c) Give two examples in which this process is used.Electroplating
July 2024
3 q
- Q1(B)(i)सहसंबंध ओळखा : पितळ : तांबे व जस्त :: ब्राँझ : ____Write the correlation: Brass : Copper and Zinc :: Bronze : ______Corrosion and Alloys
- Q2(A)(i)शास्त्रीय कारणे लिहा : सोडिअम हा कायम रॉकेलमध्ये ठेवतात.Give scientific reason: Sodium is always kept in kerosene.Properties of Metals and Non-Metals
- Q3(vi)संज्ञा स्पष्ट करा : (अ) धातुविज्ञान (ब) धातुके (क) मृदा अशुद्धी.Explain the following terms: (a) Metallurgy (b) Ores (c) Gangue.Basic Terms in Metallurgy
March 2024
4 q
- Q1(A)(v)____ पद्धतीत वितळलेल्या कथिलाचा थर धातूवर चढविण्यात येतो.In ______ process a layer of molten tin is deposited on metals.
Tap an option to check your answer.
Corrosion and Alloys - Q2(A)(ii)शास्त्रीय कारणे लिहा : विजेच्या बल्बमध्ये कुंतल बनविण्यासाठी टंगस्टन धातूचा उपयोग करतात.Give scientific reason: Tungsten metal is used to make a solenoid type coil in an electric bulb.Properties of Metals and Non-Metals
- Q2(A)(iii)शास्त्रीय कारणे लिहा : चांदीच्या वस्तू हवेत उघड्या ठेवल्या असता काळ्या पडतात.Give scientific reason: On exposure to air, silver articles turn blackish after some time.Corrosion and Alloys
- Q3(v)आयनिक संयुगांचे कोणतेही तीन सामान्य गुणधर्म लिहा.Write any three general properties of ionic compounds.Reactivity Series and Ionic Compounds
March 2023
5 q
- Q1(A)(iv)Good conductor of electricity is ______.
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Properties of Metals and Non-Metals - Q2(A)(i)Give a scientific reason: For electric power transmission, copper or aluminium wire is used.Properties of Metals and Non-Metals
- Q2(A)(ii)Give a scientific reason: Lemon or tamarind is used for cleaning copper vessels turned greenish.Corrosion and Alloys
- "NaCl is an ionic compound."Q3(iv)(a)Why is NaCl an ionic compound?Reactivity Series and Ionic Compounds
- Q3(iv)(b)State any two properties of ionic compounds.Reactivity Series and Ionic Compounds
March 2022
5 q
- Answer the following:Q2(B)(iv)(a)Name the main ore of aluminium.Ores of Aluminium
- Q2(B)(iv)(b)What impurities are present in aluminium ore?Ores of Aluminium
- Explain the following terms:Q3(vii)(a)MetallurgyBasic Terms in Metallurgy
- Q3(vii)(b)OresBasic Terms in Metallurgy
- Q3(vii)(c)Gangue.Basic Terms in Metallurgy
March 2020
4 q
- Q1(A)(v)In the Wilfley table method, the particles of gangue are separated by _______ separation method.
Tap an option to check your answer.
Concentration of Ore - Gravity Separation - Q2(B)(v)Write a short note on Alloying.Alloys and Alloying
- Q3(vii)Observe the given figure of the reactivity series of metals and answer: a. Name two metals which react with water. b. Name two moderately reactive metals. c. Name the most highly reactive metal and the most less reactive metal.Reactivity Series of Metals
- Q4(ii)Observe the picture of rusting of iron (a water drop on an iron surface, with collected rust , , ions, electrons flowing, an anode region and a cathode region) and answer: a. What is a rust? b. Write the chemical formula of rust. c. Write the reaction of oxidation of iron at the anode. d. Write the reaction (reduction) that occurs at the cathode. e. What is corrosion?Corrosion and Rusting of Iron
March 2019
4 q
- Q1(A)(5)Find the odd man out: Tinning, Anodization, Alloying, Froth flotation.Corrosion and Alloys
- Q2(6)Out of sodium and sulphur, which is a metal? Explain its reaction with oxygen.Properties of Metals and Non-Metals
- A tapping vessel opens in a tank-like container that is tapering on the lower side. The tank has an outlet for water on the upper side and a water inlet on the lower side. Finely ground ore is released in the tank. A forceful jet of water is introduced in the tank from the lower side and gangue particles and pure ore are separated by this method.Q2(7)(i)The above description is of which gravity (gravitation) separation method?Extraction of Metals
- Q2(7)(ii)Draw a labelled diagram of this method.Extraction of Metals
March 2016
1 q
- Fill in the blanks:Q1(A)(1)(iii)Corrosion can be prevented by using ______ solution.Corrosion and Alloys
The 10 board questions to practise first
The questions the board asked again come first, most asked first. Each one says how often and when.
Question 1
Asked 2 times: Jul 2024, Jun 2026* (* = numbers or wording changed that year)
Q2(B)(v)व्याख्या लिहा : (अ) धातूके (ब) मृदा अशुद्धीDefine: (a) Ores (b) Gangue.Question 2
Asked 2 times: Mar 2023, Mar 2025
Q2(A)(ii)शास्त्रीय कारणे लिहा : विद्युतपारेषणासाठी तांब्याच्या किंवा ॲल्युमिनिअमच्या तारांचा उपयोग करतात.Give scientific reason: For electric power transmission, copper or aluminium wire is used.Question 3
Asked 2 times: Mar 2023, Mar 2024* (* = numbers or wording changed that year)
Q3(v)आयनिक संयुगांचे कोणतेही तीन सामान्य गुणधर्म लिहा.Write any three general properties of ionic compounds.Question 4
This type asked 6 times: Mar 2016, Mar 2019, Mar 2020, Mar 2023, Mar 2024, Mar 2025. This one: Mar 2025
Q2(B)(ii)लोखंडी दरवाज्यावर गंज चढू नये म्हणून तुम्ही काय कराल ?What is done to prevent rusting of iron door of your house?Question 5
This type asked 5 times: Mar 2019, Mar 2023, Mar 2024, Jul 2024, Mar 2025. This one: Mar 2025
Q3(vi)नावे लिहा : (a) सुरीने सहज कापता येतील असे दोन धातू. (b) काही धातूवर आघात केला की त्यांच्यापासून ध्वनी निर्माण होतो. त्या गुणधर्माचे नाव. (c) विद्युतधारेचा सुवाहक असणारा अधातुयुक्त पदार्थ.Name the following: (a) The two metals which can be cut with a knife. (b) A sound is produced when certain metals are struck. Name this property of metals. (c) The non-metallic substance which is a good conductor of electricity.Question 6
This type asked 3 times: Mar 2019, Mar 2020, Jun 2026. This one: Jun 2026
Q4(i)आकृतीचे निरीक्षण करून खालील प्रश्नांची उत्तरे लिहा : (अ) वरील आकृतीतील पद्धतीचे नाव लिहा. (ब) वरील पद्धत कशासाठी वापरतात ? (क) वरील पद्धतीत कोणत्या दोन गुणधर्माचा उपयोग केला जातो ? (ड) ढवळणीचा काय उपयोग आहे ? (इ) संहतीकरण केलेल्या कोणत्याही एका धातुकाचे नाव लिहा.Observe the figure and answer the questions: (a) Name the method shown in the above figure. (b) For what purpose the above method is used? (c) Write two properties which are used in the method. (d) What is the use of agitator? (e) Name any one ore which is concentrated by this method.Question 7
This type asked 3 times: Mar 2020, Jul 2024, Mar 2026. This one: Mar 2026
Q2(B)(i)संमिश्रे म्हणजे काय ? त्यांची दोन उदाहरणे द्या.What is meant by an 'alloy'? Give two examples.Question 8
This type asked 2 times: Mar 2022, Mar 2026. This one: Mar 2026
Q4(ii)(अ) ॲल्युमिनिअमच्या निष्कर्षणातील मुख्य पायऱ्या स्पष्ट करा. (ब) ॲल्युमिनाचा विलयबिंदू किती आहे ? तो कमी करण्यासाठी काय करतात ? (क) ॲल्युमिनाचे विद्युत अपघटन होताना धनाग्रे वेळोवेळी का बदलावी लागतात ?(a) Write the main steps in the extraction of aluminium. (b) What is the melting point of alumina and how is the melting point reduced? (c) Why anodes need to be replaced from time to time during the electrolysis of alumina?Question 9
This type asked 2 times: Mar 2022, Jul 2024. This one: Mar 2022
Explain the following terms:Q3(vii)(a)MetallurgyQuestion 10
Asked once: Mar 2024 (same type asked 6 times)
Q1(A)(v)____ पद्धतीत वितळलेल्या कथिलाचा थर धातूवर चढविण्यात येतो.In ______ process a layer of molten tin is deposited on metals.Tap an option to check your answer.