ICSE Class 10 Chemistry Case Study based questions – Metallurgy
On this page we have given ICSE Class 10 Chemistry Chapter 7 Case Study based questions – Metallurgy. From 2024 Board exam, ICSE will focus on Technical Based, Analytical Based and Critical Questions in Chemistry Exam. So we Net Ex, has started giving Case Study based questions which is also known as Paragraph Based Questions.
Que No. 1 –
Concentration of ore by froth floatation process
Refer above figure and answer the following questions.
1.) Write the principal of froth floatation process .
2.) Explain the Froth floatation process in detail .
3.) Give other two methods of purification of ores .
Que No. 2 –
Ores are those minerals from which metals are extracted commercially at a comparatively lower cost and with minimum effort. All minerals are not ores, but all ores are minerals.
1.) Give main ores of the following metals
1) Potassium
2) Sodium
3) Calcium
2.) Give three ores of aluminium along with their chemical name.
3.) What is dressing (concentration) of ores ?
Que No. 3 –
Refining of aluminium Extraction of aluminium
Refer above two figures and answer the following questions
1.) Write reactions at anode and cathode in refining of aluminium process.
2.) Write the usage of the following
1) Fluorspar and cryolite
2) Powdered coke
3.) Give the followings properties of aluminium
1) Colour
2) Specific gravity
3) Electrons configuration
4) Atomic number
5) Valency
Answers
Que No. 1 Answers-
1.) Froth floatation process Principle: This process depends on the preferential wettability of the ore with oil (pine oil) and the gangue particles by water.
2.) The crushed ore is taken in a large tank containing pine oil and water. Potassium ethyl xanthate is added to it, a current of compressed air is passed in the tank. The whole mass is agitated. The ore is wetted by the oil and gets separated from the gangue in the form of froth.
The impurities get wetted by water and remain behind in the tank. Since the ore is lighter, it comes on the surface with the froth and impurities are left behind
3.) Methods of purification of ores are as follows:
1) Chemical Method or Leaching
2) Hydraulic washing or Gravity separation
3) Magnetic Separation
Que No. 2 Answers-
1.) The main ores of the following metals are
1) Potassium -Carnallite (KCI-MgCl2-6H₂O)
2) Zinc -Zinc blende (ZnS) Calamine (ZnCO3)
3) Calcium -Limestone, Marble
2.) Ore of Al
1.) Bauxite-Chemical name -Hydrated aluminium oxide
2.) Cryolite-Chemical name-Sodium aluminium fluoride
3.) Corundum-Chemical name-Anhydrous aluminium oxide
3.) The process of removing gangue, the rocks impurities like SiO2 present in an ore, is called concentration of an ore or ore dressing and the purified ore is called concentrated ore.
Que No. 3 Answers-
1.) Anode: Al (impure) – 3e → Al3+
Cathode: Al3+ + 3e → Al (pure)
2.) Fluorspar and cryolite-
(i) act as a solvent for the electrolytic mixture.
(ii) increases its conductivity since pure alumina is almost a non-conductor of electricity.
Powdered coke- is sprinkled over the surface of the electrolytic mixture. It:
(i) reduces heat loss by radiation.
(ii) prevents the burning of anode.
3.) Properties of aluminium
1) Colour -Silvery white metal
2) Specific gravity -2.2
3) Electrons configuration -2, 8, 3
4) Atomic number- 13
5) Valency- 3
Also See: This Chapter MCQ Questions
