Chemistry Class 10 Chapter 8
Updated: 15 Dec 2023
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Chemistry Class 10 Chapter 8 introduces the concept of “Chemical Industries”. This is mainly chapter No. 15, “Chemical Industries”, of the book of Class 10.
This article consists of Notes, SLO Based Notes and MCQs of chemistry, which cover your course, board papers and clear your chemistry concept for different types of tests.
Chemistry Class 10 Chapter 8 Notes
Chemical Industries
SLO Base Questions
Chemistry Class 10 Chapter 8 MCQs
1. To maintain high standard of living, scientist developed new methods of preparation at ___________.(a) Low cost
(b) Large scale
(c) Improved quality
(d) All of them
Show Answer
All of them
2. Scientist established ________order to meet the needs of modern society.
(a) Industries
(b) Machines
(c) None
(d) All of them
Show Answer
Industries
3. Chemical industries also play a vital role in _____development of the country.
(a) Geography
(b) Economic
(c) GDP
(d) ADP
Show Answer
Economic
4. The science that deals with the procedure used in extracting metals from their ores, purifying, alloying metals and creating useful object from metal is called _________.
(a) Metallurgy
(b) Ornithology
(c) Thermodynamics
(d) None of these
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Metallurgy
5. The naturally occurring metallic compounds are called______________.
(a) Gangue
(b) Ores
(c) mineral
(d) None of these
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mineral
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6. The aggregate of mineral and other impurities is known as ___________.(a) Gangue
(b) Ores
(c) mineral
(d) All of these
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Ores
7. The earthy material such as sand, rock, clay and other impurities attached with the ores are called __________.
(a) Gangue
(b) Ores
(c) Minerals
(d) None of these
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Gangue
8. Metals occur in nature in which state?
(a) Free state
(b) Combined state
(c) Both
(d) None of these
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Both
9. Metals exist in combined from with _______________.
(a) Oxides
(b) Halides
(c) Silicates
(d) All of these
Show Answer
All of these
10. Metals are extracted from _______by different methods.
(a) Gangue
(b) Ores
(c) Minerals
(d) Vitamins
Show Answer
Ores
11. The selection of the process for extraction of metal is mainly depend upon
(a) Type of ore
(b) Reacting of metal
(c) Nature of gangue
(d) All of them
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All of them
12. The removal of useless rocky portion of the ore is called ___________ of ore.
(a) Concentration
(b) Crushing
(c) Forth floatation
(d) None of these
Show Answer
Concentration
13. Concentration of ore is also called ___________.
(a) Enrichment of ore
(b) Dressing of ore
(c) Both a and b
(d) None of these
Show Answer
Both a and b
14. __________is an impure metal containing large amount of sand and rocky material.
(a) Mineral
(b) ore
(c) Gangue
(d) Stones
Show Answer
ore
15. The impurities in minerals like sand, rocky materials, limestone, mica etc is called _________.
(a) Mineral
(b) Ore
(c) Gangue
(d) None of these
Show Answer
Gangue
16. The gangue is also called __________.
(a) Matrix
(b) Roast
(c) Stamp mill
(d) None of these
Show Answer
Matrix
17. Huge lumps of the ores are broken into small pieces with the help of _________.
(a) Bessemer
(b) Crusher
(c) Hydraulic washer
(d) None of these
Show Answer
Crusher
18. The pieces of crushed ore is reduced to fine powder with the help of a __________.
(a) Ball mill
(b) Stamp mill
(c) Both a and b
(d) leachate
Show Answer
Both a and b
19. The conversion of crushed ore is reduced to fine powder with the help of a __________.
(a) Pulverization
(b) Calcination
(c) Concentration
(d) condensation
Show Answer
Pulverization
20. A method in which ore is concentrated to sufficient degree of purity by simply picking it with hand and breaking the rock stones with hammers is called _________.
(a) Concentration
(b) Hand picking
(c) Gravity separation
(d) None of these
Show Answer
Hand picking
21. Hydraulic washing is a method based on difference in _______ of the ores and gangue.
(a) Densities
(b) Entropy
(c) Melting point
(d) Boiling point
Show Answer
Densities
22. A method that is based on the wetting of the ore and gangue with pine oil and water is called _____.
(a) Gravity separation
(b) Smelting
(c) Froth floatation
(d) None of these
Show Answer
Froth floatation
23. Froth floatation method is especially used for _____ores.
(a) Oxide
(b) Sulphide
(c) Halide
(d) Aldehyde
Show Answer
Sulphide
24. Why concentrated ore is converted to oxide ore?
(a) Metal can obtain easily
(b) Metal can be roasted
(c) Metal has slag
(d) Metal can destroyed
Show Answer
Metal can obtain easily
25. The process in which concentrated ore is heated either alone or with some other materials in excess of air in a furnace is called ________.
(a) Smelting
(b) Bessemerization
(c) Roasting
(d) None of these
Show Answer
Roasting
26. A process in which the oxide ore in the fused state is reduced with reducing agent such as coke to get the metal is called _________.
(a) Smelting
(b) Roasting
(c) Electro-refining
(d) None of these
Show Answer
Smelting
27. In smelting process, the slag formed is called __________.
(a) Silica
(b) Iron silicate
(c) Iron oxide
(d) Silicon
Show Answer
Iron silicate
28. The molten cuprous sulphide (Cu_2S) with iron sulphide (FeS) is called ___________.
(a) Matrix
(b) Leachate
(c) Matte
(d) None of these
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Matte
29. The copper produced in Bessemerization process is known as __________.
(a) Blister Copper
(b) Pure copper
(c) Solid copper
(d) Mixed copper
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Blister Copper
30. The copper produced in Bessemer process is ________pure.
(a) 50%
(b) 97%
(c) 73%
(d) 83%
Show Answer
97%
31. Electro-refining of metals in process of obtaining pure metal from the impure one by the process of ______.
(a) Chemical decomposition
(b) Physical decomposition
(c) Electrolysis
(d) None of these
Show Answer
Electrolysis
32. Sodium carbonate is also known as _________.
(a) Washing soda
(b) Soda ash
(c) Baking soda
(d) Both a and b
Show Answer
Both a and b
33. What is the chemical formula of sodium carbonate?
(a) Na_2CO_3
(b) CaCO_3
(c) Al_2CO_3
(d) NaCaO
Show Answer
Na_2CO_3
34. __________ is domestically known as a water softner.
(a) Aluminum silicate
(b) Ammonia
(c) Sodium carbonate
(d)
Show Answer
Sodium carbonate
35. Who prepared sodium bicarbonate (NaHCO_3) and sodium carbonate (Na_2CO_3) for the first time from cheap and abundantly available raw material such as limestone and NaCl ?
(a) Ernest Solvay
(b) Max Plank
(c) Henry Bessemer
(d) Neil bohar
Show Answer
Ernest Solvay
36. On industrial scale, sodium carbonate is prepared by ___________.
(a) Electrolytic Refining
(b) Bessemerization
(c) Solvay process
(d) Fermentation
Show Answer
Solvay process
37. A __________solution of sodium chloride is called brine.
(a) Unsaturated
(b) Saturated
(c) Super-saturated
(d) Semi- saturated
Show Answer
Saturated
38. __________ is an organic compound having a carbonyl functional group attached to two amine groups.
(a) Urea
(b) Soda Ash
(c) Ammonical liquor
(d) None of these
Show Answer
Urea
39. Urea is also known as __________.
(a) Matrix
(b) Flague
(c) Carbamide
(d) Hydrogen
Show Answer
Carbamide
40 What is the chemical formula of urea?
(a) NH_4CON_2
(b) NH_2CONH_2
(c) Na_2CO_3
(d) None of these
Show Answer
NH_2CONH_2
41. Who synthesized urea from inorganic substance in 1828?
(a) Friedrich Wohler
(b) Ernest Solvay
(c) Zelinski
(d) None of these
Show Answer
Friedrich Wohler
42. _________ was the first organic compound synthesized from an inorganic compound.
(a) Sodium carbonate
(b) Urea
(c) Acetic acid
(d) None of these
Show Answer
Urea
43. In Urea, which element has the highest percentage?
(a) Carbon
(b) Hydrogen
(c) Oxygen
(d) Nitrogen
Show Answer
Nitrogen
44. In Urea, the nitrogen contents are _________.
(a) 46.67%
(b) 26.67%
(c) 20%
(d) 6.66%
Show Answer
46.67%
45. Urea ________ readily in water.
(a) dissolves
(b) Semi-dissolves
(c) Not-dissolves
(d) None of these
Show Answer
dissolves
46. The word petroleum is a combination of two ________wordsl.
(a) Greek
(b) Latin
(c) Scandinavian
(d) Arabic
Show Answer
Latin
47. The word petro means_______.
(a) Gangue
(b) Viscous Liquid
(c) Rock
(d) None of these
Show Answer
Rock
48. The petroleum is a _________ present as dark viscous liquid under the ground.
(a) Crude oil
(b) Fertilizer
(c) Asphalt
(d) None of these
Show Answer
Crude oil
49. The petroleum is mainly composed of ___________.
(a) Hydrocarbons
(b) Ammonia
(c) In Organic compounds
(d) Organic Compound
Show Answer
Hydrocarbons
50. The chines use petroleum as fuel as early as ___________.
(a) 1000 BC
(b) 500 AD
(c) 200 BC
(d) 500 BFC
Show Answer
200 BC
51. The richest deposits of petroleum are located in _____________.
(a) Saudi Arabia
(b) Kuwait
(c) USA
(d) All of these
Show Answer
All of these
52. In solid form, the petroleum is called __________.
(a) Crude oil
(b) Asphalt
(c) Natural Gas
(d) None of these
Show Answer
Asphalt
53. In liquid state, the petroleum is called___________.
(a) Crude Oil
(b) Asphalt
(c) Natural Gas
(d) None of these
Show Answer
Crude Oil
54. In gaseous form, the petroleum is called __________.
(a) Curde oil
(b) Asphalt
(c) Natural gas
(d) None of these
Show Answer
Natural gas
55. Petroleum occurs at the depth of __________or more.
(a) 100 feet
(b) 500 feet
(c) 1500 feet
(d) 1000 feet
Show Answer
500 feet
56. The conversion of crude oil into useful products with different boiling range and free from impurities is called ________.
(a) Refining
(b) Pulverizing
(c) Electrolysis
(d) hydrolytes
Show Answer
Refining
57. The crude oil is heated upto in a fractionating column.
(a) 100 {}^o C
(b) 400 {}^o C
(c) 1000 {}^o C
(d) 1200 {}^o C
Show Answer
400 {}^o C
58. When Sodium bicarbonate is heated to get sodium carbonate, all are produced except:
(a) CO
(b) CO_2
(c) Na_2CO_3
(d) H_2O
Show Answer
CO
59. Froth floatation process is concentration of ore by:
(a) Magnetically
(b) Welting of ore
(c) Density
(d) Chemically
Show Answer
Welting of ore
60. All are the raw materials for the manufacture of soda ash except :
(a) Ammonia
(b) Brine
(c) Lime stone
(d) CO
Show Answer
CO
61. All are the raw materials for the manufacturing of urea except:
(a) CO_2
(b) NH_3
(c) H_2O
(d) NaCl
Show Answer
NaCl
62. Blister copper is refined through:
(a) Concentration
(b) Reduction
(c) Electrolysis
(d) Smelting
Show Answer
Electrolysis
63. Petroleum is separate into different fractions by the process of
(a) Simple distillation
(b) Condensation
(c) Evaporation
(d) Factional distillation
Show Answer
Factional distillation
64. The concentration ore is roasted in a furnace between _________in presences of a current of air.
(a) 25 {}^o C \ to \ 100 {}^o C
(b) 500 {}^o C \ to \ 700 {}^o C
(c) 250 {}^o C \ to \ 500 {}^o C
(d) 50 {}^o C \ to \ 180 {}^o C
Show Answer
500 {}^o C \ to \ 700 {}^o C
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