{"id":14064,"date":"2024-03-22T15:57:37","date_gmt":"2024-03-22T10:27:37","guid":{"rendered":"https:\/\/tsboardsolutions.in\/?p=14064"},"modified":"2024-03-25T17:09:55","modified_gmt":"2024-03-25T11:39:55","slug":"ts-10th-class-physical-science-important-questions-chapter-11","status":"publish","type":"post","link":"https:\/\/tsboardsolutions.in\/ts-10th-class-physical-science-important-questions-chapter-11\/","title":{"rendered":"TS 10th Class Physical Science Important Questions Chapter 11 Principles of Metallurgy"},"content":{"rendered":"

These TS 10th Class Physical Science Chapter Wise Important Questions<\/a> Chapter 11 Principles of Metallurgy will help the students to improve their time and approach.<\/p>\n

TS 10th Class Physical Science Important Questions Chapter 11 Principles of Metallurgy<\/h2>\n

1 Mark Questions<\/span><\/p>\n

Question 1.
\nWhat are minerals?
\nAnswer:
\nThe elements or compounds of the metals which occur in nature in the earths crust are called minerals.<\/p>\n

Question 2.
\nWhat are ores?
\nAnswer:
\nThe minerals from which the metals are extracted without economical loss are called ores.<\/p>\n

Question 3.
\nName few highly reactive metals, which are never found in nature in free state.
\nAnswer:
\nK, Na, Ca, Mg, Al.<\/p>\n

Question 4.
\nName few moderately reactive metals.
\nAnswer:
\nZn, Fe, Pb, Cu.<\/p>\n

Question 5.
\nName few metals which occur in native state in nature. Why do they occur so?
\nAnswer:
\nGold, Platinum and Silver are the metals which occur in native state in nature because of their low chemical reactivity.<\/p>\n

\"TS<\/p>\n

Question 6.
\nWhat is dressing of an ore?
\nAnswer:
\nThe process of removal of impurities from an ore Is called dressing of the ore or concentration of the ore.<\/p>\n

Question 7.
\nWhat is activity series?
\nAnswer:
\nArranging the metals in the decreasing order of their reactivity is known as activity series
\nK>Na>Ca>Mg>Al>Zn>Fe>Pb>H>Cu>Hg>Ag>Au
\nHighly reactive Moderately reactive Less reactive<\/p>\n

Question 8.
\nHow do you extract highly reactive metals?
\nAnswer:
\nHighly reactive metals can be extracted by electrolysis of their fused compounds.<\/p>\n

Question 9.
\nHow do you extract moderately reactive metals?
\nAnswer:
\nThese metals are generally present as sulphides or carbonates. They are converted to oxides before reducing them to metals.<\/p>\n

Question 10.
\nWhat Is roasting? Give an example.
\nAnswer:
\nThe process in which the ore s heated in the presence of oxygen or air below its melting point Is called roasting.
\nEg: 2ZnS + 3O2<\/sub> \u2192 2ZnO + 2SO2<\/sub><\/p>\n

Question 11.
\nWhat is calcInation ? Give an example.
\nAnswer:
\nThe process in which the ore is heated in the absence of oxygen or air is called calcination.
\nEg: MgCO3<\/sub> \u2192 MgO + CO2<\/sub><\/p>\n

\"TS<\/p>\n

Question 12.
\nMention some properties of metals.
\nAnswer:
\nMalleability, Ductility, Sonarity, Lusture, Electrical conductivity, etc., are some properties of metals.<\/p>\n

Question 13.
\nDefine Metallurgy.
\nAnswer:
\nMetallurgy is the process of extraction of metals from their ores.<\/p>\n

Question 14.
\nWhat is the major source of metals?
\nAnswer:
\nEarth\u2019s crust is the major source of metals.<\/p>\n

Question 15.
\nWhy do we call the oxygen-sulphur group chalcogen family?
\nAnswer:
\nWe know that most of the ores of many metals are oxides and sulphides. This is why the oxygen-sulphur (16-group) group is called chalcogen furry. (Chalco-oregenus produce).<\/p>\n

Question 16.
\nArrange the following metals In descending order of their reactivity. K, Zn, Ag, Fe, Ca, Au, Na, Pb.
\nAnswer:
\nHighly reactive metals: K, Na, Ca
\nModerately reactive metals: Zn, Fe, Pb
\nLow reactive metals: Ag, Au
\nThe descending order of their reactivity: K, Na, Ca, Zn, Fe, Pb, Ag, Au,<\/p>\n

Question 17.
\nWhat is concentration or dressing?
\nAnswer:
\nConcentration or dressing means, simply getting rid of as much of the unwanted rocky material as possible before the ore is converted Into the metal.<\/p>\n

Question 18.
\nHow to choose a physical method in enriching of the ore?
\nAnswer:
\nThe physical methods adopted in dressing or enriching of the ore depends upon difference between physical properties of ore and gangue.<\/p>\n

Question 19.
\nGive an example for reduction of metal oxide with carbon.
\nAnswer:
\nThe oxides are reduced by coke In a dosed female which gives the metal and carbon monoxide.
\n\"TS<\/p>\n

Question 20.
\nGive an example for reduction of oxide ore with CO. (ASI)
\nAnswer:
\n\"TS<\/p>\n

Question 21.
\nWhat is refining?
\nAnswer:
\nThe process of obtaining the pure metal from the impure metal is called refining of the metal.<\/p>\n

Question 22.
\nMention some important methods of refining.
\nAnswer:
\nThe important methods of refining are.
\na) Distillation
\nb) Poling
\nc) Liquation
\nd) Electrolysis.<\/p>\n

\"TS<\/p>\n

Question 23.
\nWhat is flux?
\nAnswer:
\nFlux Is a substance added to the ore to remove the gangue from it by reacting with ore. It the impurity is acidic substance, basic substance is used as flux and vice-versa.<\/p>\n

Question 24.
\nWhat is the role of furnace in metallurgy?
\nAnswer:
\nThe furnace is the one which is used to carry out pyrochemical processes In metallurgy.<\/p>\n

Question 25.
\nWhy do we add impurities to electrolytes during electrolytic extraction of metals?
\nAnswer:
\nA large quantity of electricity is required to keep the ore in molten state, during electrolysis. Hence suitable impurities are added to the ore (electrolyte) to decrease its melting point.<\/p>\n

Question 26.
\nHow do various metals In the activity series react with chlorine on heating?
\nAnswer:<\/p>\n